taskschd/tests: Fix memory leaks (Valgrind).

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=18033

Your paranoid android.


=== w1064 (32 bit scheduler) ===
scheduler.c:159: Test failed: expected ERROR_INVALID_NAME, got 0x80070002
scheduler.c:204: Test failed: expected ERROR_PATH_NOT_FOUND, got 0x80070002
scheduler.c:354: Test failed: expected ERROR_FILE_NOT_FOUND, got 0
scheduler.c:767: Test failed: expected ERROR_PATH_NOT_FOUND, got 0x80070002
scheduler.c:773: Test failed: expected ERROR_PATH_NOT_FOUND, got 0x80070002
scheduler.c:941: Test failed: expected ERROR_FILE_NOT_FOUND, got 0