Remove unnecessary method call.

src/Markup/Avalonia.Markup.Xaml/Converters/IconTypeConverter.cs

@@ -34,16 +34,11 @@ namespace Avalonia.Markup.Xaml.Converters
             var bitmap = value as IBitmap;
             if (bitmap != null)
             {
-                return CreateIconFromBitmap(bitmap);
+                return new WindowIcon(bitmap);
             }
             throw new NotSupportedException();
         }
 
-        private WindowIcon CreateIconFromBitmap(IBitmap bitmap)
-        {
-            return new WindowIcon(bitmap);
-        }
-
         private WindowIcon CreateIconFromPath(IValueContext context, string path)
         {
             var uri = new Uri(path, UriKind.RelativeOrAbsolute);