[PATCH] dinput/tests: Remove some redundant NULL pointer checks (Coverity).

[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=48115

Your paranoid android.


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

dinput:
mouse.c:173: Test failed: GetDeviceData() failed: 00000000 cnt:0

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

dinput:
mouse.c:173: Test failed: GetDeviceData() failed: 00000000 cnt:0

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

dinput:
mouse.c:173: Test failed: GetDeviceData() failed: 00000000 cnt:0

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

dinput:
mouse.c:173: Test failed: GetDeviceData() failed: 00000000 cnt:0