fix some compile warnings

src/db.c

@@ -1400,7 +1400,7 @@ int *georadiusGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numk
 /* XREAD [BLOCK <milliseconds>] [COUNT <count>] [GROUP <groupname> <ttl>]
  *       STREAMS key_1 key_2 ... key_N ID_1 ID_2 ... ID_N */
 int *xreadGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numkeys) {
-    int i, num, *keys;
+    int i, num = 0, *keys;
     UNUSED(cmd);
 
     /* We need to parse the options of the command in order to seek the first

src/sentinel.c

@@ -3525,7 +3525,7 @@ void sentinelSetCommand(client *c) {
 badfmt: /* Bad format errors */
     if (changes) sentinelFlushConfig();
     addReplyErrorFormat(c,"Invalid argument '%s' for SENTINEL SET '%s'",
-        c->argv[badarg]->ptr,option);
+        (char*)c->argv[badarg]->ptr,option);
 }
 
 /* Our fake PUBLISH command: it is actually useful only to receive hello messages