xfs: remove unused args from xfs_alloc_buftarg()

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

diff --cc fs/xfs/xfs_buf.c
Simple merge

diff --cc fs/xfs/xfs_buf.h
Simple merge

diff --cc fs/xfs/xfs_super.c
Simple merge