tests: Quiesce -fanalyzer file/memory leak errors
tests: Quiesce -fanalyzer file/memory leak errors

The analyzer correctly points out that constructions like

    g_assert(fopen("/dev/wishyouwerehere", "r") == NULL);

can leak. But these are unit tests, we don't care about leaks on
assertion failures.

martinpitt/umockdev,martinpitt/umockdev,martinpitt/umockdev