[PATCH] advapi32/tests: Fix an uninitialized variable check in test_performance_keys().

[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=95678

Your paranoid android.


=== w10pro64_zh_CN (64 bit report) ===

advapi32:
registry.c:568: Test failed: data_count set to 9 instead of 7
registry.c:572: Test failed: data set to 'xxxxxxxxx' instead of 'foobar' or 'xxxxxxx'