progs/fp: Redraw upon keypress.
diff --git a/progs/fp/tri-depth.c b/progs/fp/tri-depth.c
index 5488469..a9f3a6a 100644
--- a/progs/fp/tri-depth.c
+++ b/progs/fp/tri-depth.c
@@ -57,7 +57,7 @@
       case 27:
 	exit(1);
       default:
-	return;
+	break;
     }
 
     glutPostRedisplay();