Trivial fix for this compile warning:

v4l/sh_mobile_ceu_camera.c:1789: warning: label 'exit_free_irq' defined but not used
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>