[util] Return unchanged matrix if matrix cannot be inverted

src/util/util_matrix.cpp

@@ -205,6 +205,10 @@ namespace dxvk {
     Vector4 dot0    = { m[0] * row0 };
     float dot1      = (dot0.x + dot0.y) + (dot0.z + dot0.w);
 
+    if (unlikely(std::abs(dot1) <= 0.000001f)) {
+      return m;
+    }
+
     return inverse * (1.0f / dot1);
   }