Fixed a bug that caused the generation of the uncompilable expression "&*IntPtr".

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -243,6 +243,7 @@ namespace CppSharp.Generators.CSharp
                 }
                 else
                 {
+                    instance = instance.Trim('*');
                     Context.SupportBefore.WriteLine(
                         "CppSharp.Runtime.Helpers.memcpy({0}, new IntPtr(&{1}), new UIntPtr({2}));",
                         instanceName, instance, @class.Layout.Size);