blur-effect: Silence compiler warning

Building with `debugoptimized` throws:
`'paint_opacity' may be used uninitialized in this function`

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1596>

diff --git a/src/shell-blur-effect.c b/src/shell-blur-effect.c
index 7003b68f7c2cd2de59c6ad9cc9c61e3e312a5d4e..16bf086de68d3f8e472d595b2761369119276974 100644 (file)
--- a/src/shell-blur-effect.c
+++ b/src/shell-blur-effect.c
@@ -615,6 +615,10 @@ shell_blur_effect_paint_node (ClutterEffect           *effect,
         case SHELL_BLUR_MODE_BACKGROUND:
           paint_opacity = 255;
           break;
+
+        default:
+          g_assert_not_reached();
+          break;
         }
 
       if (needs_repaint (self, flags))