[PATCH] ole32: Remove useless casts to self

[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=48451

Your paranoid android.


=== debian9 (64 bit WoW report) ===

ole32:
clipboard.c:1524: Test failed: gle 5
clipboard.c:1526: Test failed: gle 1418
clipboard.c:1528: Test failed: gle 1418
clipboard.c:1536: Test failed: got 800401d0
Unhandled exception: page fault on read access to 0x00000000 in 64-bit code (0x00007fa4d0caced8).

Report errors:
ole32:clipboard crashed (c0000005)