Merge pull request #8955 from workgroupengineering/fixes/core/MicroCom

fix(MicroComProxyBase): CS8073 The result of the expression is always 'false' since a value of type 'IntPtr' is never equal to 'null'

src/Avalonia.MicroCom/MicroComProxyBase.cs

@@ -65,7 +65,7 @@ namespace Avalonia.MicroCom
 
         protected virtual void Dispose(bool disposing)
         {
-            if(_nativePointer == null)
+            if(_nativePointer == IntPtr.Zero)
                 return;
             if (_ownsHandle)
             {