[mutter] cogl/test-readpixel: Remove unused variables

[Jonas Ådahl <jadahl src gnome org>]

commit 22c8f179d2b849708bdb481563bbdf3704dbf7d9
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue Oct 15 11:54:14 2019 +0200

    cogl/test-readpixel: Remove unused variables
    
    These were added as part of commit d4ff5e2d but they're not needed.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/857

 cogl/tests/conform/test-readpixels.c | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/cogl/tests/conform/test-readpixels.c b/cogl/tests/conform/test-readpixels.c
index 45d137791..3c7c512db 100644
--- a/cogl/tests/conform/test-readpixels.c
+++ b/cogl/tests/conform/test-readpixels.c
@@ -152,8 +152,6 @@ test_readpixels (TestUtilsGTestFixture *fixture,
 {
   unsigned int idle_source;
   ClutterActor *stage;
-  ClutterActorIter iter;
-  ClutterActor *actor;
 
   stage = clutter_stage_get_default ();
   clutter_stage_set_color (CLUTTER_STAGE (stage), &stage_color);