xen/blkback: move persistent grants flags to bool
The struct persistent_gnt flags member is meant to be a bitfield of different flags. There is only PERSISTENT_GNT_ACTIVE flag left, so convert it to a bool named "active". Signed-off-by: NJuergen Gross <jgross@suse.com> Reviewed-by: NRoger Pau Monné <roger.pau@citrix.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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