fix build on amd64

R=ken
OCL=32521
CL=32521

src/cmd/5g/ggen.c

@@ -68,6 +68,8 @@ compile(Node *fn)
 	genlist(curfn->enter);
 	genlist(curfn->nbody);
 	checklabels();
+	if(nerrors != 0)
+		goto ret;
 
 	if(curfn->type->outtuple != 0)
 		ginscall(throwreturn, 0);

src/cmd/6g/ggen.c

@@ -70,6 +70,8 @@ compile(Node *fn)
 	genlist(curfn->nbody);
 	gclean();
 	checklabels();
+	if(nerrors != 0)
+		goto ret;
 
 	if(curfn->type->outtuple != 0)
 		ginscall(throwreturn, 0);

src/cmd/6g/list.c

@@ -101,6 +101,9 @@ Dconv(Fmt *fp)
 		break;
 
 	case D_BRANCH:
+		if(a->branch == nil)
+			snprint(str, sizeof(str), "<nil>");
+		else
 			snprint(str, sizeof(str), "%ld", a->branch->loc);
 		break;
 

src/cmd/8g/ggen.c

@@ -68,6 +68,8 @@ compile(Node *fn)
 	genlist(curfn->nbody);
 	gclean();
 	checklabels();
+	if(nerrors != 0)
+		goto ret;
 
 	if(curfn->type->outtuple != 0)
 		ginscall(throwreturn, 0);