[media] drivers/media/video/tlg2300/pd-video.c: Remove second mutex_unlock in pd_vidioc_s_fmt

Error path in file drivers/media/video/tlg2300/pd-video.c:
1. First mutex_unlock on &pd->lock in line 767 (in function that
called from line 805)
2. Second in line 806

805 pd_vidioc_s_fmt(pd, &f->fmt.pix);
806 mutex_unlock(&pd->lock);

Found by Linux Device Drivers Verification Project

Signed-off-by: Alexander Strakh <[e-mail]>
Acked-by: Huang Shijie <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/tlg2300/pd-video.c

···
 	}
 	ret |= send_set_req(pd, VIDEO_ROSOLU_SEL,
 				vid_resol, &cmd_status);
-	if (ret || cmd_status) {
-		mutex_unlock(&pd->lock);
+	if (ret || cmd_status)
 		return -EBUSY;
-	}
 
 	pix_def->pixelformat = pix->pixelformat; /* save it */
 	pix->height = (context->tvnormid & V4L2_STD_525_60) ?  480 : 576;