Fix: Compilation error with XCode 16.3

Currently linking will fail if OpenMP is used. It will be addressed in a separate PR.

Pull Request: https://projects.blender.org/blender/blender/pulls/136816

source/blender/blenlib/BLI_math_matrix_types.hh

@@ -691,7 +691,7 @@ struct MatView : NonCopyable, NonMovable {
 
   friend std::ostream &operator<<(std::ostream &stream, const MatView &mat)
   {
-    return stream << mat->mat;
+    return stream << mat.mat;
   }
 };