Fix memory leaks in loader_test.

[Kerilk]

I was playing with valgrind and found a couple of memory leaks in the loader test, this patch addresses these.

[bashbaug]

Thanks for the fixes!

I'm a little surprised some of the other test_create_calls() do not require do not require releases also, but this is a definite improvement.

[Kerilk]

I'm a little surprised some of the other test_create_calls() do not require do not require releases also, but this is a definite improvement.

Yes, these are done in the test_release function at the end, that puzzled me too. There are no leaks that valgrind would report that I know of anymore.