dm ioctl: move compat code

Move compat_ioctl handling into dm-ioctl.c.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

diff --cc drivers/md/dm-ioctl.c
Simple merge

diff --cc fs/compat_ioctl.c
Simple merge

diff --cc include/linux/dm-ioctl.h
Simple merge