[media] em28xx: do not claim VBI support if the device is a camera

Avoids registering a VBI device and streaming in VBI-mode if the device is a
camera.
Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/em28xx/em28xx-core.c

@@ -681,6 +681,11 @@ int em28xx_vbi_supported(struct em28xx *dev)
 	if (disable_vbi == 1)
 		return 0;
 
+	if (dev->board.is_webcam)
+		return 0;
+
+	/* FIXME: check subdevices for VBI support */
+
 	if (dev->chip_id == CHIP_ID_EM2860 ||
 	    dev->chip_id == CHIP_ID_EM2883)
 		return 1;