[PATCH 05/21] dlls/mfplat/tests: use correct integral type

[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=109657

Your paranoid android.


=== w7u_el (32 bit report) ===

mfplat:
0868:mfplat: unhandled exception c0000005 at 6EFA7D1C