Patch for compositor-drm.c

[Christopher Michael]

Hi All,

Attached is a patch which fixes some cleanup issues for the drm-based 
compositor. Basically, if we fail to allocate space for the crtcs in the 
compositor, then we need to free the drm mode resources before exiting 
the create_outputs function. We should also free these resources (in the 
same create_outputs function) if the compositor output_list is empty.

Cheers,
devilhorns