Removed all warnings in the C# part.

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

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -972,7 +972,6 @@ namespace CppSharp.Generators.CSharp
 
             if (decl is Function)
             {
-                var function = decl as Function;
                 if (isAbstract)
                 {
                     Write(";");

src/Generator/Passes/GenerateSymbolsPass.cs

@@ -47,7 +47,6 @@ namespace CppSharp.Passes
                            where symbolsCodeGenerators.ContainsKey(module)
                            select module).ToList();
             remainingCompilationTasks = modules.Count;
-            var cppTypePrinter = new CppTypePrinter { PrintScopeKind = TypePrintScopeKind.Qualified };
             foreach (var module in modules.Where(symbolsCodeGenerators.ContainsKey))
             {
                 var symbolsCodeGenerator = symbolsCodeGenerators[module];

src/Generator/Passes/RenamePass.cs

@@ -142,8 +142,7 @@ namespace CppSharp.Passes
             if (decl.Name == null)
                 return true;
 
-            var renamed = Rename(decl);
-            return true;
+            return Rename(decl);
         }
 
         private bool Rename(Declaration decl)