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realemu: fix REP prefix condition

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

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

@@ -1067,7 +1067,7 @@

 {

 	if(rep == OREPNE)

 		return (*f & ZF) == 0;

-	return !rep || (*f & ZF) != 0;

+	return (*f & ZF) != 0;

 }

 static void

@@ -1098,7 +1098,7 @@

 		d->off += n;

 		d->off &= m;

 		c--;

-		if(repcond(f, i->rep))

+		if(!repcond(f, i->rep))

 			break;

 	}

 	aw(areg(cpu, i->alen, RDI), d->off);

@@ -1135,7 +1135,7 @@

 		d->off += n;

 		d->off &= m;

 		c--;

-		if(repcond(f, i->rep))

+		if(!repcond(f, i->rep))

 			break;

 	}

 	aw(areg(cpu, i->alen, RDI), d->off);

-- 

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