Fixed the generation for parameters of type void**.

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

src/Generator/Generators/CSharp/CSharpMarshal.cs

@@ -546,7 +546,8 @@ namespace CppSharp.Generators.CSharp
                 }
 
                 pointer.QualifiedPointee.Visit(this);
-                bool isVoid = primitive == PrimitiveType.Void && pointee.IsAddress();
+                bool isVoid = primitive == PrimitiveType.Void &&
+                    pointee.IsAddress() && pointer.IsReference();
                 if (pointer.Pointee.Desugar(false) is TemplateParameterSubstitutionType ||
                     isVoid)
                 {

tests/Common/Common.Tests.cs

@@ -9,7 +9,7 @@ using Enum = CommonTest.Enum;
 public class CommonTests : GeneratorTestFixture
 {
     [Test]
-    public void TestCodeGeneration()
+    public unsafe void TestCodeGeneration()
     {
 #pragma warning disable 0168 // warning CS0168: The variable `foo' is declared but never used
 #pragma warning disable 0219 // warning CS0219: The variable `foo' is assigned but its value is never used
@@ -58,6 +58,7 @@ public class CommonTests : GeneratorTestFixture
         Common.SMallFollowedByCapital();
         Common.IntegerOverload(0);
         Common.IntegerOverload((uint) 0);
+        Common.TakeVoidStarStar(null);
         using (new DerivedFromSecondaryBaseWithIgnoredVirtualMethod()) { }
 
 #pragma warning restore 0168

tests/Common/Common.cpp

@@ -1010,3 +1010,7 @@ void integerOverload(unsigned long i)
 void takeReferenceToVoidStar(const void*& p)
 {
 }
+
+void takeVoidStarStar(void** p)
+{
+}

tests/Common/Common.h

@@ -1481,3 +1481,4 @@ DLL_API void integerOverload(unsigned int i);
 DLL_API void integerOverload(long i);
 DLL_API void integerOverload(unsigned long i);
 DLL_API void takeReferenceToVoidStar(const void*& p);
+DLL_API void takeVoidStarStar(void** p);