More informative error when DEBUG RELOAD fails.

src/debug.c

@@ -222,7 +222,7 @@ void debugCommand(redisClient *c) {
         }
         emptyDb();
         if (rdbLoad(server.dbfilename) != REDIS_OK) {
-            addReply(c,shared.err);
+            addReplyError(c,"Error trying to load the RDB dump");
             return;
         }
         redisLog(REDIS_WARNING,"DB reloaded by DEBUG RELOAD");