[PATCH] d3d10core/tests: 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=47477

Your paranoid android.


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

d3d10core:
d3d10core.c:4626: Test failed: Got unexpected hr 0x8876086a.
Unhandled exception: page fault on read access to 0x6976656c in 32-bit code (0x7ed24978).

=== debian9 (32 bit Japanese:Japan report) ===

d3d10core:
d3d10core.c:4626: Test failed: Got unexpected hr 0x8876086a.
Unhandled exception: page fault on read access to 0x6976656c in 32-bit code (0x7ec3c978).

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

d3d10core:
d3d10core.c:4423: Test failed: Got unexpected hr 0x8876086a for query type 4.
Unhandled exception: page fault on read access to 0x6976656c in 32-bit code (0x7eb6e978).

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

d3d10core:
Unhandled exception: page fault on read access to 0x6976656c in 32-bit code (0x7ed2e978).