winspool.drv/tests: Fix the OpenPrinter() tests error reporting.

[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://newtestbot.winehq.org/JobDetails.pl?Key=3070

Your paranoid android.


=== w864 (32 bit info) ===
info.c:2923: Test failed: AddJobA() failed le=50
info.c:2929: Test failed: GetJobA() failed le=87
info: unhandled exception c0000005 at 0040B24A

=== w864 (64 bit info) ===
info.c:2923: Test failed: AddJobA() failed le=50
info.c:2929: Test failed: GetJobA() failed le=87
info.c:2972: Test failed: AddJobA() failed le=50
info.c:2978: Test failed: GetJobA() failed le=87
info: unhandled exception c0000005 at 00000000004099E0