xf86: check return value of XF86_CRTC_CONFIG_PTR in xf86CompatOutput()
If privates[xf86CrtcConfigPrivateIndex].ptr is NULL, this will cause
a segfault.
Possible fix for xorg/xserver#1241 (closed)
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If privates[xf86CrtcConfigPrivateIndex].ptr is NULL, this will cause
a segfault.
Possible fix for xorg/xserver#1241 (closed)