Minor fix in variable naming (Unable to cast object of type 'Decompiler.ILVariable' to type 'Mono.Cecil.ParameterDefinition')

ICSharpCode.Decompiler/Ast/NameVariables.cs

@@ -97,7 +97,7 @@ namespace Decompiler
 			switch (expr.Code) {
 				case ILCode.Ldfld:
 					// Use the field name only if it's not a field on this (avoid confusion between local variables and fields)
-					if (!(expr.Arguments[0].Code == ILCode.Ldloc && ((ParameterDefinition)expr.Arguments[0].Operand).Index < 0))
+					if (!(expr.Arguments[0].Code == ILCode.Ldarg && ((ParameterDefinition)expr.Arguments[0].Operand).Index < 0))
 						return ((FieldReference)expr.Operand).Name;
 					break;
 				case ILCode.Ldsfld: