call gluDeleteQuadric() to fix mem leak
diff --git a/progs/demos/reflect.c b/progs/demos/reflect.c
index 9cd71d1..1a45041 100644
--- a/progs/demos/reflect.c
+++ b/progs/demos/reflect.c
@@ -181,6 +181,8 @@
    glMaterialfv( GL_FRONT, GL_EMISSION, black );
    gluCylinder( q, 1.5, 0.0,  2.5, 15, 1 );
    glEndList();
+
+   gluDeleteQuadric(q);
 }