Very minor code cleanup in ImGuiController.

src/ImGui.NET.SampleProgram/ImGuiController.cs

@@ -328,7 +328,7 @@ namespace ImGuiNET
 
         private void UpdateImGuiInput(InputSnapshot snapshot)
         {
-            var io = ImGui.GetIO();
+            ImGuiIOPtr io = ImGui.GetIO();
 
             Vector2 mousePosition = snapshot.MousePosition;
 
@@ -340,8 +340,6 @@ namespace ImGuiNET
             float delta = snapshot.WheelDelta;
             io.MouseWheel = delta;
 
-            io.MouseWheel = delta;
-
             IReadOnlyList<char> keyCharPresses = snapshot.KeyCharPresses;
             for (int i = 0; i < keyCharPresses.Count; i++)
             {