bug in argument passing

R=r
OCL=16044
CL=16044

src/cmd/gc/dcl.c

@@ -806,13 +806,15 @@ addtyp(Type *n, Type *t, int ctxt)
 	t->sym = s;
 	t->vargen = vargen;
 
-	dowidth(t);
-	for(f=s->forwtype; f!=T; f=f->nforw) {
-		if(!isptr[f->etype])
-			fatal("addtyp: forward");
-		f->type = t;
+	if(s->forwtype != T) {
+		dowidth(t);
+		for(f=s->forwtype; f!=T; f=f->nforw) {
+			if(!isptr[f->etype])
+				fatal("addtyp: forward");
+			f->type = t;
+		}
+		s->forwtype = T;
 	}
-	s->forwtype = T;
 
 	d = dcl();
 	d->dsym = s;