[PATCH] ole32: Remove redundant NULL check before CoTaskMemFree()

[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=46898

Your paranoid android.


=== debian9 (32 bit report) ===

ole32:
clipboard.c:1049: Test failed: OleIsCurrentClipboard returned 0
clipboard.c:1117: Test failed: 1 WM_DRAWCLIPBOARD received

=== debian9 (32 bit Chinese:China report) ===

ole32:
clipboard.c:1049: Test failed: OleIsCurrentClipboard returned 0
clipboard.c:1117: Test failed: 1 WM_DRAWCLIPBOARD received