btrfs: pass struct btrfs_inode to btrfs_free_reserved_data_space_noquota()

As well as the last patch, pass struct btrfs_inode to the function and
let it distinguish which data space it is working on in a later patch.
There is no functional change with this commit.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>