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devip: provide large buffer for ipifc->local() generator

The ipifc->local generator is the big exception,
dumping the whole link structure of the interface.

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

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

@@ -93,7 +93,7 @@

 		p = "remote";

 		break;

 	case Qsnoop:

-		if(strcmp(cv->p->name, "ipifc") != 0)

+		if(cv->p != ipfs[c->dev]->ipifc)

 			return -1;

 		devdir(c, q, "snoop", qlen(cv->sq), cv->owner, 0400, dp);

 		return 1;

@@ -674,13 +674,22 @@

 		}

 		goto Readstr;

 	case Qlocal:

+		x = f->p[PROTO(ch->qid)];

+		c = x->conv[CONV(ch->qid)];

+		if(x == f->ipifc && x->local != nil){

+			buf = smalloc(Maxstate);

+			if(waserror()){

+				free(buf);

+				nexterror();

+			}

+			(*x->local)(c, buf, Maxstate);

+			goto Readstr;

+		}

 		buf = smalloc(Maxstring);

 		if(waserror()){

 			free(buf);

 			nexterror();

 		}

-		x = f->p[PROTO(ch->qid)];

-		c = x->conv[CONV(ch->qid)];

 		if(x->local == nil) {

 			snprint(buf, Maxstring, "%I!%d\n", c->laddr, c->lport);

 		} else {

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

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

@@ -267,7 +267,7 @@

 		ifc->in, ifc->out, ifc->inerr, ifc->outerr,

 		ifc->speed, ifc->delay);

-	for(lifc = ifc->lifc; lifc != nil && n > m; lifc = lifc->next)

+	for(lifc = ifc->lifc; lifc != nil; lifc = lifc->next)

 		m += snprint(state+m, n - m, slineformat, lifc->local,

 			lifc->mask, lifc->remote, lifc->validlt, lifc->preflt);

 	if(ifc->lifc == nil)