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devip: rlock ifc before accessing interface parameters in ipifcstate()

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

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

@@ -258,6 +258,7 @@

 	int m;

 	ifc = (Ipifc*)c->ptcl;

+	rlock(ifc);

 	m = snprint(state, n, sfixedformat,

 		ifc->dev, ifc->maxtu, ifc->sendra6, ifc->recvra6,

 		ifc->rp.mflag, ifc->rp.oflag, ifc->rp.maxraint,

@@ -266,7 +267,6 @@

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

 		ifc->speed, ifc->delay);

-	rlock(ifc);

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

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

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