Remove coords_flat variable

jatin837 · jatin837 · commit 0397f7a66357 · 2021-10-22T16:45:30.000+05:30
diff --git a/lib/matplotlib/tests/test_collections.py b/lib/matplotlib/tests/test_collections.py
@@ -771,7 +771,6 @@ def test_quadmesh_deprecated_positional(fig_test, fig_ref):
     X += 0.2 * Y
     coords = np.stack([X, Y], axis=-1)
     assert coords.shape == (3, 4, 2)
-    coords_flat = coords.copy().reshape(-1, 2)
     C = np.linspace(0, 2, 12).reshape(3, 4)
 
     ax = fig_test.add_subplot()
