fixup: typo query_channel_pref

src/cntlr_ubus.c

@@ -311,7 +311,7 @@ out:
 	return ret;
 }
 
-int cntlr_ubus_query_channel_perf(struct ubus_context *ctx,
+int cntlr_ubus_query_channel_pref(struct ubus_context *ctx,
 				  struct ubus_object *obj,
 				  struct ubus_request_data *req,
 				  const char *method,