advapi32: Fix potential NULL pointer dereference in RegSetValueExA [with test] (Saturn)

[Aurimas Fišeras]

Saturn's error report:
(INCONSISTENT USE) Possible null dereference of variable data+(count-1).
This variable is checked for Null at lines: registry.c:1051

Tested on Windows XP

Changelog:
    advapi32: Fix potential NULL pointer dereference in RegSetValueExA
[with test] (Saturn)


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