btrfs: remove repeated word in struct member comment

Comment for processed extent end of range has an unnecessary "in",
remove it.

Signed-off-by: Nigel Christian <nigel.l.christian@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
1 file changed