sys/dev/xen/netfront/netfront.c: 	In netif_free(), call ifmedia_removeall() after ether_ifdetach() 	so that bpf listeners are detached, any link state processing 	is completed, and there is no chance for external reference to media 	information.
sys/dev/xen/netfront/netfront.c:
	In netif_free(), call ifmedia_removeall() after ether_ifdetach()
	so that bpf listeners are detached, any link state processing
	is completed, and there is no chance for external reference to media
	information.

Suggested by:	yongari
MFC after:	1 week

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