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realemu: make sure instruction arguments are initialized even when decoding traps

--- a/sys/src/cmd/aux/realemu/decode.c

+++ b/sys/src/cmd/aux/realemu/decode.c

@@ -572,6 +572,7 @@

 	i->dsreg = RDS;

 	i->olen = cpu->olen;

 	i->alen = cpu->alen;

+	i->a1 = i->a2 = i->a3 = nil;

 	for(;;){

 		i->code = ar(ip); ip->off++;

@@ -608,7 +609,6 @@

 	if(i->sreg == 0)

 		i->sreg = i->dsreg;

-	i->a1 = i->a2 = i->a3 = nil;

 	for(;;){

 		if(t->a1)

 			i->a1 = getarg(ip, i, t->a1);