logfs get_sb, part 2

take setting s_bdev/s_mtd/s_devops to callers of logfs_get_sb_device(),
don't bother passing them separately

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/logfs/dev_bdev.c
Simple merge

diff --cc fs/logfs/dev_mtd.c
Simple merge

diff --cc fs/logfs/logfs.h
Simple merge

diff --cc fs/logfs/super.c
Simple merge