removed assert causing an illegal memory access. This was responsible of...

removed assert causing an illegal memory access. This was responsible of crashes during BLPOP and other list blocking operations.

src/t_list.c

@@ -817,7 +817,6 @@ int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele) {
 
         /* This should remove the first element of the "clients" list. */
         unblockClientWaitingData(receiver);
-        redisAssert(ln != listFirst(clients));
 
         if (dstkey == NULL) {
             /* BRPOP/BLPOP */