btrfs/file.c: remove an unsed varialbe first_index

The commit b37392ea86 ("Btrfs: cleanup unnecessary parameter
and variant of prepare_pages()") makes it redundant.

Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Shan Hai <haishan.bai@hotmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Shan Hai 2015-09-21 11:40:57 +08:00 • committed by David Sterba
commit bb78915203