[media] em28xx: remove obsolete field 'frame' from struct em28xx_buffer

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/em28xx/em28xx.h

@@ -252,7 +252,6 @@ struct em28xx_buffer {
 	/* common v4l buffer stuff -- must be first */
 	struct videobuf_buffer vb;
 
-	struct list_head frame;
 	int top_field;
 };