btrfs: clean up header members offsets in write helpers

Move header offsetof() to the expression that calculates the address so
it's part of get_eb_offset_in_page where the 2nd parameter is the member
offset.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1 file changed