The patch: add bdi backing to mount session
	(b3d0ab7e)

Has a bug in the placement of the bdi member at
struct exofs_sb_info. The layout member must be kept
last.
Signed-off-by: NBoaz Harrosh <bharrosh@panasas.com>
Signed-off-by: NJens Axboe <jens.axboe@oracle.com>