progs/fp: Redraw upon keypress.
diff --git a/progs/fp/tri-inv.c b/progs/fp/tri-inv.c
index 7e8d8c5..7e490fa 100644
--- a/progs/fp/tri-inv.c
+++ b/progs/fp/tri-inv.c
@@ -56,7 +56,7 @@
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();