btrfs: remove do_list variable at btrfs_clear_delalloc_extent()

The "do_list" variable has a rather confusing name, so remove it and
directly use btrfs_is_free_space_inode() instead.

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>