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devip: make sure ifc is bound in add6 ctl command

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

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

@@ -1576,7 +1576,7 @@

 }

 char*

-ipifcadd6(Ipifc *ifc, char**argv, int argc)

+ipifcadd6(Ipifc *ifc, char **argv, int argc)

 {

 	int plen = 64;

 	char addr[40], preflen[6];

@@ -1583,6 +1583,7 @@

 	char *params[3];

 	uchar prefix[IPaddrlen];

 	Iplifc lifc;

+	Medium *m;

 	lifc.onlink = 1;

 	lifc.autoflag = 1;

@@ -1616,9 +1617,10 @@

 		return Ebadarg;

 	/* issue "add" ctl msg for v6 link-local addr and prefix len */

-	if(ifc->m->pref2addr == nil)

+	m = ifc->m;

+	if(m == nil || m->pref2addr == nil)

 		return Ebadarg;

-	(*ifc->m->pref2addr)(prefix, ifc->mac);	/* mac → v6 link-local addr */

+	(*m->pref2addr)(prefix, ifc->mac);	/* mac → v6 link-local addr */

 	sprint(addr, "%I", prefix);

 	sprint(preflen, "/%d", plen);