btrfs: extent-tree: Use btrfs_ref to refactor btrfs_free_extent()

Similar to btrfs_inc_extent_ref(), just use btrfs_ref to replace the
long parameter list and the confusing @owner parameter.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
5 files changed