block: xen-blkback: use API provided by xenbus module to map rings
The xenbus module provides xenbus_map_ring_valloc() and xenbus_map_ring_vfree(). Use these to map the ring pages granted by the frontend. Acked-by: NJens Axboe <jaxboe@fusionio.com> Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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