Update unity_fixture_Test.c

[../Unity-master/extras/fixture/test/unity_fixture_Test.c:530]: (error) Deallocating a deallocated pointer: n1

This solution from Daniel Fischer was helpful in fixing the error because if realloc returns a pointer to a different location, the old location is freed.

Found by https://github.com/bryongloden/cppcheck

extras/fixture/test/unity_fixture_Test.c

@@ -527,7 +527,6 @@ TEST(InternalMalloc, ReallocFailDoesNotFreeMem)
     TEST_ASSERT_NULL(out_of_mem);
     TEST_ASSERT_NOT_EQUAL(n2, n1);
     free(n2);
-    free(n1);
     free(m);
 #endif
 }