qcacld-3.0: Fix return type of umac_stop_complete_cb

Return type of umac_stop_complete_cb is QDF_STATUS when
QDF_ENABLE_TRACING feature is disabled. It not matching with the same
API defined when QDF_ENABLE_TRACING is enabled.

To resolve this, update return type of umac_stop_complete_cb to void
when QDF_ENABLE_TRACING feature is disabled.

Change-Id: I59783520a7fdf8bef4424fed649898b5547da280
CRs-Fixed: 2686544

core/mac/src/sys/common/src/wlan_qct_sys.c

@@ -65,7 +65,7 @@ static void umac_stop_complete_cb(void *user_data)
 	QDF_ASSERT(QDF_IS_STATUS_SUCCESS(qdf_status));
 }
 #else
-static QDF_STATUS umac_stop_complete_cb(void *user_data)
+static void umac_stop_complete_cb(void *user_data)
 {
 	return;
 }