btrfs/file.c: remove an unsed varialbe first_index
The commit b37392ea ("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>
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