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devip: make "null" medium bindable

It can actually be usefull to bind this dummy
"null" medium to an address, which gives a way to
divert packets towards it that should be discarded.

--- a/sys/src/9/ip/nullmedium.c

+++ b/sys/src/9/ip/nullmedium.c

@@ -10,7 +10,6 @@

 static void

 nullbind(Ipifc*, int, char**)

 {

-	error("cannot bind null device");

 }

 static void

@@ -27,6 +26,7 @@

 Medium nullmedium =

 {

+.maxtu=		64*1024,

 .name=		"null",

 .bind=		nullbind,

 .unbind=	nullunbind,

@@ -36,6 +36,7 @@

 /* used in ipifc to prevent unbind while bind is in progress */

 Medium unboundmedium =

 {

+.maxtu=		64*1024,

 .name=		"unbound",

 .bind=		nullbind,

 .unbind=	nullunbind,