qosmngr: consider more warnings as errors and fix discovered issues

This patch series makes compiler consider most warnings as errors, making them more visible. Additionally, most issues reported by compiler are resolved.

src/main.c

@@ -57,20 +57,20 @@ static struct ubus_object test_object = {
  *  @param : none
  *  return : none
  */
-void qosmngr_version()
+void qosmngr_version(void)
 {
 	syslog(LOG_ERR, "version       : %s.%s\n", qosmngr_base_version, qosmngr_xtra_version);
 }
 
 /**
  *  To expose the qosmngr object on ubus i.e., qos with method queue_stats
- *  @param ctx input parameter pointer to ubus context
+ *  @param context input parameter pointer to ubus context
  *  retrun integer value 0 on success and -1 on failure
  */
-static int qosmngr_publish_object(struct ubus_context *ctx)
+static int qosmngr_publish_object(struct ubus_context *context)
 {
 	int ret;
-	ret = ubus_add_object(ctx, &test_object);
+	ret = ubus_add_object(context, &test_object);
 	if (ret) {
 		syslog(LOG_ERR, "Failed to add 'qos' ubus object: %s\n",
 			ubus_strerror(ret));