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devip: cleanup ipmux.c

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

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

@@ -758,7 +758,7 @@

 		ip6 = (Ip6hdr*)bp->rp;

 		p = f->t2p[ip6->proto];

 	}

-	if(p && p->rcv)

+	if(p != nil && p->rcv != nil)

 		(*p->rcv)(p, ifc, bp);

 	else

 		freeblist(bp);

-- 

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