Check NULL pointer input for vEventGroupDelete. (#293)

* Check NULL pointer input for vEventGroupDelete.

* Change the input parameter check with assertion.

Co-authored-by: Cobus van Eeden <35851496+cobusve@users.noreply.github.com>
diff --git a/event_groups.c b/event_groups.c
index 0ee7990..4a12430 100644
--- a/event_groups.c
+++ b/event_groups.c
@@ -625,6 +625,8 @@
 

 void vEventGroupDelete( EventGroupHandle_t xEventGroup )

 {

+    configASSERT( xEventGroup );

+

     EventGroup_t * pxEventBits = xEventGroup;

     const List_t * pxTasksWaitingForBits = &( pxEventBits->xTasksWaitingForBits );