btrfs: call inode_to_path directly and drop indirection

The functions for iterating inode reference take a function parameter
but there's only one value, inode_to_path(). Remove the indirection and
call the function. As paths_from_inode would become just an alias for
iterate_irefs(), merge the two into one function.

Signed-off-by: David Sterba <dsterba@suse.com>