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devip: ignore addmulti() errors in addselfcache()

If the interface does not support multicast, ignore it.

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

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

@@ -953,10 +953,18 @@

 			a, type, ifc, tifc);

 		if(type & Rmulti){

-			if(ifc->m->addmulti != nil)

-				(*ifc->m->addmulti)(ifc, a, lifc->local);

-			if(multicastreportfn != nil)

-				(*multicastreportfn)(f, ifc, a, lifc->local, 0);

+			if(ifc->m->addmulti != nil){

+				if(!waserror()){

+					(*ifc->m->addmulti)(ifc, a, lifc->local);

+					poperror();

+				}

+			}

+			if(multicastreportfn != nil){

+				if(!waserror()){

+					(*multicastreportfn)(f, ifc, a, lifc->local, 0);

+					poperror();

+				}

+			}

 		}

 	} else

 		lp->ref++;