Fixed the generated C# when returning a non-const char*.

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

src/AST/Type.cs

@@ -447,7 +447,8 @@ namespace CppSharp.AST
             return Declaration.Type.Equals(typedef == null ? obj : typedef.Declaration.Type);
         }
 
-        public override int GetHashCode() => Declaration.Type.GetHashCode();
+        public override int GetHashCode() =>
+            Declaration.OriginalName.GetHashCode() ^ Declaration.Type.GetHashCode();
     }
 
     /// <summary>

tests/CSharp/CSharp.Tests.cs

@@ -94,6 +94,8 @@ public unsafe class CSharpTests : GeneratorTestFixture
         {
         }
 
+        CSharp.CSharp.ReturnCharPointer();
+
 #pragma warning restore 0168
 #pragma warning restore 0219
     }

tests/CSharp/CSharp.cpp

@@ -1542,3 +1542,12 @@ void InterfaceTester::setInterface(SimpleInterface* i)
 {
     interface = i;
 }
+
+void va_listFunction(va_list v)
+{
+}
+
+char* returnCharPointer()
+{
+    return 0;
+}

tests/CSharp/CSharp.h

@@ -1298,3 +1298,6 @@ public:
 private:
     SimpleInterface* interface;
 };
+
+DLL_API void va_listFunction(va_list v);
+DLL_API char* returnCharPointer();