staging: lustre: remove cfs_ip_addr_free wrapper

No need to have a one line wrapper in libcfs that only
is used to delete a list which is only done once in the
LNet layer.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>