Small code cleanup. Non-functional change.

src/Generator/Generators/CSharp/CSharpGenerator.cs

@@ -33,7 +33,7 @@ namespace CppSharp.Generators.CSharp
             // CheckAbiParameters runs last because hidden structure parameters
             // should always occur first.
 
-            Driver.AddTranslationUnitPass(new CheckAbiParameters(Driver.Options));
+            Driver.AddTranslationUnitPass(new CheckAbiParameters());
 
             return true;
         }

src/Generator/Passes/CheckAbiParameters.cs

@@ -20,13 +20,6 @@ namespace CppSharp.Passes
     /// </summary>
     public class CheckAbiParameters : TranslationUnitPass
     {
-        private readonly DriverOptions options;
-
-        public CheckAbiParameters(DriverOptions options)
-        {
-            this.options = options;
-        }
-
         public override bool VisitFunctionDecl(Function function)
         {
             if (!VisitDeclaration(function))