[media] omap3isp: Add missing mutex_destroy() calls

Mutexes must be destroyed with mutex_destroy(). Add missing calls in the
modules cleanup handlers.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/omap3isp/ispvideo.c b/drivers/media/video/omap3isp/ispvideo.c
index 7d74ebb..d100072 100644
--- a/drivers/media/video/omap3isp/ispvideo.c
+++ b/drivers/media/video/omap3isp/ispvideo.c
@@ -1328,6 +1328,8 @@
 void omap3isp_video_cleanup(struct isp_video *video)
 {
 	media_entity_cleanup(&video->video.entity);
+	mutex_destroy(&video->stream_lock);
+	mutex_destroy(&video->mutex);
 }
 
 int omap3isp_video_register(struct isp_video *video, struct v4l2_device *vdev)