demos: silence warning
diff --git a/progs/demos/dinoshade.c b/progs/demos/dinoshade.c
index 41b19d5..cbf8751 100644
--- a/progs/demos/dinoshade.c
+++ b/progs/demos/dinoshade.c
@@ -382,7 +382,7 @@
 static void
 redraw(void)
 {
-  int start, end;
+  int start = 0, end = 0;
 
   if (reportSpeed) {
     start = glutGet(GLUT_ELAPSED_TIME);