[PATCH] kernelbase: Zero out retkey in the ERROR_INVALID_HANDLE case in RegOpenKeyEx

[Jefferson Carpenter]

Fixes https://bugs.winehq.org/show_bug.cgi?id=48798

Felt a little weird putting my own name under the Copyright section, but 
it seemed to be the precedent for adding tests.

thanks,
Jefferson

[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=67940

Your paranoid android.

=== wxppro (32 bit report) ===

kernelbase:
0ed8:registry: unhandled exception c0000005 at 00000000

=== w2008s64 (32 bit report) ===

kernelbase:
0390:registry: unhandled exception c0000005 at 00000000

=== w2008s64 (64 bit report) ===

kernelbase:
0390:registry: unhandled exception c0000005 at 0000000000000000