[xf86-video-ati] segfault if Option "NoAccel" is set

[Matthieu Herrb]

Hi,

the current ati driver tries to call RADEONSetupMemEXA(), which in turns
 calls exaDriverAlloc() even if option "NoAccel" is set.

Since in this case the "exa" module is not loaded, this causes a
segfault on the function call.

The attached patch is a crude fix for it, since xaa behaves better wrt
"NoAccel".
-- 
Matthieu Herrb
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