drm: Add reference counting to blob properties

Reference-count drm_property_blob objects, changing the API to
ref/unref.

Signed-off-by: Daniel Stone <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
[danvet: Squash in kerneldoc fixup from Daniel Stone.]
[danvet: Squash in Oops fix from Thiery Reding.]
Signed-off-by: Daniel Vetter <[email protected]>
2 files changed