Fix some wrong server.dirty increments (#8140)

Fix wrong server dirty increment in
* spopWithCountCommand
* hsetCommand
* ltrimCommand
* pfaddCommand

Some didn't increment the amount of fields (just one per command).
Others had excessive increments.

src/db.c

@@ -616,6 +616,9 @@ void flushAllDataAndResetRDB(int flags) {
         rdbSave(server.rdb_filename,rsiptr);
         server.dirty = saved_dirty;
     }
+
+    /* Without that extra dirty++, when db was already empty, FLUSHALL will
+     * not be replicated nor put into the AOF. */
     server.dirty++;
 #if defined(USE_JEMALLOC)
     /* jemalloc 5 doesn't release pages back to the OS when there's no traffic.

src/hyperloglog.c

@@ -1211,7 +1211,7 @@ void pfaddCommand(client *c) {
     if (updated) {
         signalModifiedKey(c,c->db,c->argv[1]);
         notifyKeyspaceEvent(NOTIFY_STRING,"pfadd",c->argv[1],c->db->id);
-        server.dirty++;
+        server.dirty += updated;
         HLL_INVALIDATE_CACHE(hdr);
     }
     addReply(c, updated ? shared.cone : shared.czero);

src/t_hash.c

@@ -644,7 +644,7 @@ void hsetCommand(client *c) {
     }
     signalModifiedKey(c,c->db,c->argv[1]);
     notifyKeyspaceEvent(NOTIFY_HASH,"hset",c->argv[1],c->db->id);
-    server.dirty++;
+    server.dirty += (c->argc - 2)/2;
 }
 
 void hincrbyCommand(client *c) {

src/t_list.c

@@ -508,7 +508,7 @@ void ltrimCommand(client *c) {
         notifyKeyspaceEvent(NOTIFY_GENERIC,"del",c->argv[1],c->db->id);
     }
     signalModifiedKey(c,c->db,c->argv[1]);
-    server.dirty++;
+    server.dirty += (ltrim + rtrim);
     addReply(c,shared.ok);
 }
 

src/t_set.c

@@ -476,7 +476,7 @@ void spopWithCountCommand(client *c) {
 
     /* Generate an SPOP keyspace notification */
     notifyKeyspaceEvent(NOTIFY_SET,"spop",c->argv[1],c->db->id);
-    server.dirty += count;
+    server.dirty += (count >= size) ? size : count;
 
     /* CASE 1:
      * The number of requested elements is greater than or equal to
@@ -492,7 +492,6 @@ void spopWithCountCommand(client *c) {
         /* Propagate this command as a DEL operation */
         rewriteClientCommandVector(c,2,shared.del,c->argv[1]);
         signalModifiedKey(c,c->db,c->argv[1]);
-        server.dirty++;
         return;
     }
 
@@ -594,7 +593,6 @@ void spopWithCountCommand(client *c) {
     decrRefCount(propargv[0]);
     preventCommandPropagation(c);
     signalModifiedKey(c,c->db,c->argv[1]);
-    server.dirty++;
 }
 
 void spopCommand(client *c) {