Fix crash in CreateDCA

[Maxime Bellengé]

I have an application which calls CreateDCA with lpszDriver set to
"DISPLAY" and lpInitData parameter not set to NULL. So CreateDCA calls
GdiConvertToDevmodeW which crashes in memcpy because the lpInitData only
contains garbage.
MSDN states that if lpszDriver is DISPLAY, lpInitData must be NULL.
This patch adds a check to prevent this crash.

Max

ChangeLog:
    * Prevent CreateDCA from crashing if a bad lpInitData parameter is
provided
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