md: remove lock_bdev / unlock_bdev

These wrappers for blkdev_get / blkdev_put just horribly confuse the
code with their odd naming.  Remove them and improve the error unwinding
in md_import_device with the now folded code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Song Liu <song@kernel.org>