xen-blkfront.c: make blkif_ioctl() static
This patch makes the needlessly global blkif_ioctl() static. Signed-off-by: NAdrian Bunk <bunk@kernel.org> Acked-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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