drm/radeon/dce4+: don't use radeon_crtc for vblank callback

This might be called before we've allocated the radeon_crtcs

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2012-08-15 17:13:53 -04:00
commit 4a15903db0