[gdi32/dc] Fix possible NULL pointer dereference (Coverity)

[Paul Vriens]

Hi,

The new function DC_ReleaseDCPtr doesn't check for NULL. So we should fix it here.

No use in putting the NULL check in DC_ReleaseDCPtr as it seems only 2 callers
have issues with it (according to Coverity) and it will add a lot more NULL
checks effectively.

Should fix Coverity #601.

Changelog
   Fix possible NULL pointer dereference

Cheers,

Paul.

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