drm: remove some potentially dangerous DRM_ERRORs

commit acb4b992d8a13728044f430b47b9199aa45993e9 upstream.

Each of these error messages can be caused by a broken or malicious
userspace wanting to spam the dmesg with useless info.  They're really
not worthy of DRM_DEBUG statements either; those are generally only
useful during bringup of new hardware or versions, and ought to be
removed before going upstream anyway.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
[bwh: Backported to 3.2: s/r\./r->/ in drm_mode_addfb()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>