rnoland d58762730f Some general cleanup of scatter/gather memory allocation
- We don't need to check malloc return values with M_WAITOK
 - remove variables that we don't really need
 - cleanup the error paths by just calling drm_sg_cleanup()
 - fix drm_sg_cleanup() to be safe to call at any time

MFC after:	2 weeks
2009-10-30 18:02:10 +00:00
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