Added appropriate delete statements.

src/dawn/assert/assert.cpp

@@ -26,11 +26,11 @@
     assertTrue(false);
   }
 
-  void assertNotNull(const void *pointer) {
+  void assertNotNull(void *pointer) {
     assertTrue(pointer != nullptr && pointer != NULL);
   }
 
-  void assertNull(const void *pointer) {
+  void assertNull(void *pointer) {
     assertTrue(pointer == NULL || pointer == nullptr);
   }