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devip: reject incompatible multicast/interface ip address pairs for ipifcaddmulti()

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

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

@@ -1466,6 +1466,9 @@

 	Ipifc *ifc;

 	Fs *f;

+	if(isv4(ma) != isv4(ia))

+		error("incompatible multicast/interface ip address");

+

 	for(l = &c->multi; *l != nil; l = &(*l)->next)

 		if(ipcmp(ma, (*l)->ma) == 0 && ipcmp(ia, (*l)->ia) == 0)

 			return;		/* it's already there */