Jesse Barnes bee2ddf35f Fail CRTC configuration if !vtSema ...

Unless we check for vtSema before calling into the CRTC and output callbacks,
we may end up trying to access video memory that no longer exists, leading to a
crash.  So if we don't have vtSema, return FALSE to the caller, indicating that
we didn't do anything.

Fixes #14444.

2008-03-17 08:33:01 -07:00

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