btrfs: rename page offset parameter in submit_extent_page

We're going to remove sector_t and will use 'offset', so this patch
frees the name.

Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-10-04 17:10:34 +02:00
commit 6c5a4e2c12