btrfs: dev-replace: replace's scrub must not be running in suspended state
When the replace state is in the suspended state, btrfs_scrub_cancel() should fail with -ENOTCONN as there is no scrub running. As a safety catch check if btrfs_scrub_cancel() returns -ENOTCONN and assert if it doesn't. Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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