btrfs: zoned: remove redundant assignment in btrfs_check_zoned_mode

Remove the redundant assignment to zone_info variable in
btrfs_check_zoned_mode function.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Signed-off-by: David Sterba <dsterba@suse.com>