[PATCH 6/6] user32/tests: Add missing return value check to msg tests (Coverity)

[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=35156

Your paranoid android.


=== wxppro (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w2003std (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== wvistau64 (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w2008s64 (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w7u (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w7pro64 (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w8 (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w864 (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w1064 (32 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== wvistau64 (64 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w2008s64 (64 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w7pro64 (64 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w864 (64 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0

=== w1064 (64 bit msg) ===
msg.c:13109: Test failed: DialogBox error 0