[PATCH] gdi32: Remove useless casts to self

[Marvin]

Hi,

While running your changed tests, 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=55344

Your paranoid android.


=== debian10 (32 bit Chinese:China report) ===

gdi32:
font.c:6304: Test failed: expected vertical face for charset 128, got Droid Sans Fallback
font.c:6304: Test failed: expected vertical face for charset 129, got Droid Sans Fallback
font.c:6304: Test failed: expected vertical face for charset 130, got Droid Sans Fallback
font.c:6304: Test failed: expected vertical face for charset 134, got Droid Sans Fallback
font.c:6304: Test failed: expected vertical face for charset 136, got Droid Sans Fallback