Fix brpop command table entry and redirect blocked clients.

Author: sgn1

src/cluster.c

@@ -5418,8 +5418,9 @@ int clusterRedirectBlockedClientIfNeeded(client *c) {
             return 1;
         }
 
+        /* All keys must belong to the same slot, so check first key only. */
         di = dictGetIterator(c->bpop.keys);
-        while((de = dictNext(di)) != NULL) {
+        if ((de = dictNext(di)) != NULL) {
             robj *key = dictGetKey(de);
             int slot = keyHashSlot((char*)key->ptr, sdslen(key->ptr));
             clusterNode *node = server.cluster->slots[slot];

src/server.c

@@ -152,7 +152,7 @@ struct redisCommand redisCommandTable[] = {
     {"linsert",linsertCommand,5,"wm",0,NULL,1,1,1,0,0},
     {"rpop",rpopCommand,2,"wF",0,NULL,1,1,1,0,0},
     {"lpop",lpopCommand,2,"wF",0,NULL,1,1,1,0,0},
-    {"brpop",brpopCommand,-3,"ws",0,NULL,1,1,1,0,0},
+    {"brpop",brpopCommand,-3,"ws",0,NULL,1,-2,1,0,0},
     {"brpoplpush",brpoplpushCommand,4,"wms",0,NULL,1,2,1,0,0},
     {"blpop",blpopCommand,-3,"ws",0,NULL,1,-2,1,0,0},
     {"llen",llenCommand,2,"rF",0,NULL,1,1,1,0,0},