[PATCH] Don't crash on xf86DuplicateMode(NULL)

[Nicolas Trangez]

Hija,

I do not know the policy of handling (invalid) NULL function arguments
in the Xserver. The utility function xf86DuplicateMode crashes the
server when calling with a NULL argument (*pNew = *pMode, where pMode =
0x0) when trying the avivo driver, both on my system, and on someone
else's as just reported on irc (bugzilla #11651).

This small patch handles this case in the utility function and lets it
up to the driver to handle the invalid mode problem.

Regards,

Nicolas
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