V4L: ivtv: fix VIDIOC_S_FBUF: new OSD values were never set

V4L: ivtv: fix VIDIOC_S_FBUF: new OSD values were never set

cherry picked from commit c3624f99a8c06cfe75e0b06f23a7f7cea9d2d5ff

ivtv: fix VIDIOC_S_FBUF support: new OSD values were never actually set.

The values set with VIDIOC_S_FBUF were not actually used until the next
VIDIOC_S_FMT. Fixed.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>