drm/amdgpu/display: Unlock mutex on error

Make sure we pass through ret label to unlock the mutex.

Signed-off-by: John van der Kamp <sjonny@suffe.me.uk>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
John van der Kamp 2020-06-23 23:30:54 +02:00 • committed by Alex Deucher
commit ee434a4f9f