Aligned nullptr check for heap3. (#493)

Signed-off-by: Cervenka Dusan <cervenka@acrios.com>
diff --git a/portable/MemMang/heap_3.c b/portable/MemMang/heap_3.c
index 8ed3d1b..671705b 100644
--- a/portable/MemMang/heap_3.c
+++ b/portable/MemMang/heap_3.c
@@ -82,7 +82,7 @@
 

 void vPortFree( void * pv )

 {

-    if( pv )

+    if( pv != NULL )

     {

         vTaskSuspendAll();

         {