Remove unused variable

src/networking.cpp

@@ -163,7 +163,6 @@ client *createClient(connection *conn, int iel) {
     c->multibulklen = 0;
     c->bulklen = -1;
     c->sentlen = 0;
-    c->sentlenAsync = 0;
     c->flags = 0;
     c->fPendingAsyncWrite = FALSE;
     c->fPendingAsyncWriteHandler = FALSE;

src/replication.cpp

@@ -4343,7 +4343,6 @@ void replicationCacheMaster(redisMaster *mi, client *c) {
     if (c->flags & CLIENT_MULTI) discardTransaction(c);
     listEmpty(c->reply);
     c->sentlen = 0;
-    c->sentlenAsync = 0;
     c->reply_bytes = 0;
     c->bufpos = 0;
     resetClient(c);

src/server.h

@@ -1610,7 +1610,6 @@ struct client {
     unsigned long long reply_bytes; /* Tot bytes of objects in reply list. */
     size_t sentlen;         /* Amount of bytes already sent in the current
                                buffer or object being sent. */
-    size_t sentlenAsync;    /* same as sentlen buf for async buffers (which are a different stream) */
     time_t ctime;           /* Client creation time. */
     long duration;          /* Current command duration. Used for measuring latency of blocking/non-blocking cmds */
     time_t lastinteraction; /* Time of the last interaction, used for timeout */