V4L/DVB (8680): saa7134-core.c: fix warning

drivers/media/video/saa7134/saa7134-core.c:366: warning:
'saa7134_buffer_requeue' defined but not used

Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>