[PATCH v2] kernelbase: Zero out retkey in the ERROR_INVALID_HANDLE case in RegOpenKeyExW

[Jefferson Carpenter]

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

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=67941

Your paranoid android.

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

advapi32:
registry.c:1087: Test failed: expected hkResult == NULL