Sentinel: increment pending_commands counter in two more places.

AUTH and SCRIPT KILL were sent without incrementing the pending commands
counter. Clearly this needs some kind of wrapper doing it for the caller
in order to be less bug prone.

src/sentinel.c

@@ -1298,9 +1298,10 @@ void sentinelSendAuthIfNeeded(sentinelRedisInstance *ri, redisAsyncContext *c) {
     char *auth_pass = (ri->flags & SRI_MASTER) ? ri->auth_pass :
                                                  ri->master->auth_pass;
 
-    if (auth_pass)
-        redisAsyncCommand(c, sentinelDiscardReplyCallback, NULL, "AUTH %s",
-            auth_pass);
+    if (auth_pass) {
+        if (redisAsyncCommand(c, sentinelDiscardReplyCallback, NULL, "AUTH %s",
+            auth_pass) == REDIS_OK) ri->pending_commands++;
+    }
 }
 
 /* Create the async connections for the specified instance if the instance
@@ -1689,8 +1690,10 @@ void sentinelPingReplyCallback(redisAsyncContext *c, void *reply, void *privdata
                 (ri->flags & SRI_S_DOWN) &&
                 !(ri->flags & SRI_SCRIPT_KILL_SENT))
             {
-                redisAsyncCommand(ri->cc,
-                    sentinelDiscardReplyCallback, NULL, "SCRIPT KILL");
+                if (redisAsyncCommand(ri->cc,
+                        sentinelDiscardReplyCallback, NULL,
+                        "SCRIPT KILL") == REDIS_OK)
+                    ri->pending_commands++;
                 ri->flags |= SRI_SCRIPT_KILL_SENT;
             }
         }