shell32/tests: make sure return values are used (LLVM/Clang) (4/7)

[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
http://testbot.winehq.org/JobDetails.pl?Key=9177

Your paranoid android.


=== WNT4WSSP6 (32 bit shlfileop) ===
shlfileop.c:2210: Test failed: SHGetNewLinkInfoA succeeded