Fix typo and some out of date comments (#8449)

Fix typo and some out of date comments

src/db.c

@@ -106,9 +106,8 @@ robj *lookupKeyReadWithFlags(redisDb *db, robj *key, int flags) {
     robj *val;
 
     if (expireIfNeeded(db,key) == 1) {
-        /* Key expired. If we are in the context of a master, expireIfNeeded()
+        /* If we are in the context of a master, expireIfNeeded() returns 1
-         * returns 0 only when the key does not exist at all, so it's safe
+         * when the key is no longer valid, so we can return NULL ASAP. */
-         * to return NULL ASAP. */
         if (server.masterhost == NULL)
             goto keymiss;
 

src/defrag.c

@@ -638,7 +638,7 @@ int defragRaxNode(raxNode **noderef) {
 }
 
 /* returns 0 if no more work needs to be been done, and 1 if time is up and more work is needed. */
-int scanLaterStraemListpacks(robj *ob, unsigned long *cursor, long long endtime, long long *defragged) {
+int scanLaterStreamListpacks(robj *ob, unsigned long *cursor, long long endtime, long long *defragged) {
     static unsigned char last[sizeof(streamID)];
     raxIterator ri;
     long iterations = 0;
@@ -958,7 +958,7 @@ int defragLaterItem(dictEntry *de, unsigned long *cursor, long long endtime) {
         } else if (ob->type == OBJ_HASH) {
             server.stat_active_defrag_hits += scanLaterHash(ob, cursor);
         } else if (ob->type == OBJ_STREAM) {
-            return scanLaterStraemListpacks(ob, cursor, endtime, &server.stat_active_defrag_hits);
+            return scanLaterStreamListpacks(ob, cursor, endtime, &server.stat_active_defrag_hits);
         } else if (ob->type == OBJ_MODULE) {
             return moduleLateDefrag(dictGetKey(de), ob, cursor, endtime, &server.stat_active_defrag_hits);
         } else {

src/evict.c

@@ -135,7 +135,7 @@ void evictionPoolAlloc(void) {
 
 /* This is an helper function for performEvictions(), it is used in order
  * to populate the evictionPool with a few entries every time we want to
- * expire a key. Keys with idle time smaller than one of the current
+ * expire a key. Keys with idle time bigger than one of the current
  * keys are added. Keys are always added if there are free entries.
  *
  * We insert keys on place in ascending order, so keys with the smaller

src/expire.c

@@ -83,9 +83,8 @@ int activeExpireCycleTryExpire(redisDb *db, dictEntry *de, long long now) {
  * keys that can be removed from the keyspace.
  *
  * Every expire cycle tests multiple databases: the next call will start
- * again from the next db, with the exception of exists for time limit: in that
+ * again from the next db. No more than CRON_DBS_PER_CALL databases are
- * case we restart again from the last database we were processing. Anyway
+ * tested at every iteration.
- * no more than CRON_DBS_PER_CALL databases are tested at every iteration.
  *
  * The function can perform more or less work, depending on the "type"
  * argument. It can execute a "fast cycle" or a "slow cycle". The slow
@@ -141,7 +140,7 @@ void activeExpireCycle(int type) {
 
     /* This function has some global state in order to continue the work
      * incrementally across calls. */
-    static unsigned int current_db = 0; /* Last DB tested. */
+    static unsigned int current_db = 0; /* Next DB to test. */
     static int timelimit_exit = 0;      /* Time limit hit in previous call? */
     static long long last_fast_cycle = 0; /* When last fast cycle ran. */
 

src/quicklist.c

@@ -1427,7 +1427,7 @@ void quicklistPush(quicklist *quicklist, void *value, const size_t sz,
  * Returns 1 on success (creation of new bookmark or override of an existing one).
  * Returns 0 on failure (reached the maximum supported number of bookmarks).
  * NOTE: use short simple names, so that string compare on find is quick.
- * NOTE: bookmakrk creation may re-allocate the quicklist, so the input pointer
+ * NOTE: bookmark creation may re-allocate the quicklist, so the input pointer
          may change and it's the caller responsibilty to update the reference.
  */
 int quicklistBookmarkCreate(quicklist **ql_ref, const char *name, quicklistNode *node) {

src/rdb.h

@@ -45,7 +45,7 @@
  * the first byte to interpreter the length:
  *
  * 00|XXXXXX => if the two MSB are 00 the len is the 6 bits of this byte
- * 01|XXXXXX XXXXXXXX =>  01, the len is 14 byes, 6 bits + 8 bits of next byte
+ * 01|XXXXXX XXXXXXXX =>  01, the len is 14 bits, 6 bits + 8 bits of next byte
  * 10|000000 [32 bit integer] => A full 32 bit len in net byte order will follow
  * 10|000001 [64 bit integer] => A full 64 bit len in net byte order will follow
  * 11|OBKIND this means: specially encoded object will follow. The six bits

src/t_string.c

@@ -764,7 +764,7 @@ void stralgoLCS(client *c) {
                 addReplyError(c,
                     "The specified keys must contain string values");
                 /* Don't cleanup the objects, we need to do that
-                 * only after callign getDecodedObject(). */
+                 * only after calling getDecodedObject(). */
                 obja = NULL;
                 objb = NULL;
                 goto cleanup;

src/tls.c

@@ -350,7 +350,7 @@ ConnectionType CT_TLS;
  * socket operation.
  *
  * When this happens, we need to do two things:
- * 1. Make sure we register for the even.
+ * 1. Make sure we register for the event.
  * 2. Make sure we know which handler needs to execute when the
  *    event fires.  That is, if we notify the caller of a write operation
  *    that it blocks, and SSL asks for a read, we need to trigger the