Forget to unreserve after pinning.  This can lead to problems in
soft reset and resume.

v2: rework patch as per Michel's suggestion.
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NMichel Dänzer <michel.daenzer@amd.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>