redis-cli: fix big keys search when the key no longer exist.

The code freed a reply object that was never created, resulting in a
segfault every time randomkey returned a key that was deleted before we
queried it for size.

src/redis-cli.c

@@ -1323,7 +1323,6 @@ static void findBigKeys(void) {
         } else if (!strcmp(reply2->str,"none")) {
             freeReplyObject(reply1);
             freeReplyObject(reply2);
-            freeReplyObject(reply3);
             continue;
         } else {
             fprintf(stderr, "Unknown key type '%s' for key '%s'\n",