media: ov2659: fix unbalanced mutex_lock/unlock

media: ov2659: fix unbalanced mutex_lock/unlock

[ Upstream commit 384538bda10913e5c94ec5b5d34bd3075931bcf4 ]

Avoid returning with mutex locked.

Fixes: fa8cb6444c32 ("[media] ov2659: Don't depend on subdev API")

Cc: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>