[media] em28xx: fix incorrect s_ctrl error code and wrong call to res_free

Calling subdevs to handle s_ctrl returned a non-zero return code even if
everything went fine.

Calling STREAMOFF if no STREAMON happened earlier would hit a BUG_ON
in res_free.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-video.c

@@ -1434,7 +1434,7 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
 
 	/* It isn't an AC97 control. Sends it to the v4l2 dev interface */
 	if (rc == 1) {
-		v4l2_device_call_all(&dev->v4l2_dev, 0, core, s_ctrl, ctrl);
+		rc = v4l2_device_call_until_err(&dev->v4l2_dev, 0, core, s_ctrl, ctrl);
 
 		/*
 		 * In the case of non-AC97 volume controls, we still need
@@ -1708,11 +1708,15 @@ static int vidioc_streamoff(struct file *file, void *priv,
 			fh, type, fh->resources, dev->resources);
 
 	if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
-		videobuf_streamoff(&fh->vb_vidq);
-		res_free(fh, EM28XX_RESOURCE_VIDEO);
+		if (res_check(fh, EM28XX_RESOURCE_VIDEO)) {
+			videobuf_streamoff(&fh->vb_vidq);
+			res_free(fh, EM28XX_RESOURCE_VIDEO);
+		}
 	} else if (fh->type == V4L2_BUF_TYPE_VBI_CAPTURE) {
-		videobuf_streamoff(&fh->vb_vbiq);
-		res_free(fh, EM28XX_RESOURCE_VBI);
+		if (res_check(fh, EM28XX_RESOURCE_VBI)) {
+			videobuf_streamoff(&fh->vb_vbiq);
+			res_free(fh, EM28XX_RESOURCE_VBI);
+		}
 	}
 
 	return 0;