stop using a reserved name in the example project.

Author: mvandervoord

assets/test_example_file_crash.c

@@ -19,7 +19,7 @@ void test_add_numbers_adds_numbers(void) {
 
 void test_add_numbers_will_fail(void) {
   // Platform-independent way of forcing a crash
-  uint32_t* nullptr = (void*) 0;
-  uint32_t i = *nullptr;
+  uint32_t* a_null_pointer = (void*)0;
+  uint32_t i = *a_null_pointer;
   TEST_ASSERT_EQUAL_INT(2, add_numbers(i,2));
 }