[4/6] shell32/tests: Check for failures in the child process.

[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=20062

Your paranoid android.


=== w1064 (32 bit shlexec) ===
shlexec.c:2408: Test failed: failed: rc=29 err=2
shlexec.c:2408: Test failed: failed: rc=29 err=32
shlexec.c:2408: Test failed: failed: rc=29 err=2
shlexec.c:2408: Test failed: failed: rc=29 err=32

=== w1064 (64 bit shlexec) ===
shlexec.c:2408: Test failed: failed: rc=29 err=2
shlexec.c:2408: Test failed: failed: rc=29 err=32
shlexec.c:2408: Test failed: failed: rc=29 err=2
shlexec.c:2408: Test failed: failed: rc=29 err=32