Apply suggestions from code review

Co-authored-by: Copilot <[email protected]>

Author: siegfriedpammer

ICSharpCode.Decompiler/IL/ILAmbience.cs

@@ -173,13 +173,11 @@ void WriteTypeDefinition(ITypeDefinition typeDef)
 					WriteTypeDefinition(typeDef.DeclaringTypeDefinition);
 					writer.Write('.');
 				}
-				else if (ConversionFlags.HasFlag(ConversionFlags.UseFullyQualifiedEntityNames))
+				else if (ConversionFlags.HasFlag(ConversionFlags.UseFullyQualifiedEntityNames)
+					&& !string.IsNullOrEmpty(typeDef.Namespace))
 				{
-					if (!string.IsNullOrEmpty(typeDef.Namespace))
-					{
-						writer.Write(typeDef.Namespace);
-						writer.Write('.');
-					}
+					writer.Write(typeDef.Namespace);
+					writer.Write('.');
 				}
 				writer.Write(typeDef.Name);
 				WriteTypeParameters(typeDef.TypeParameters, typeDef);
@@ -194,15 +192,15 @@ void WriteTypeParameters(IReadOnlyList<ITypeParameter> typeParameters, IEntity o
 					{
 						switch (owner)
 						{
-							case IType t:
+							case IType:
 								writer.Write("`");
 								break;
-							case IMethod m:
+							case IMethod _:
 								writer.Write("``");
 								break;
 						}
 
-						writer.Write(typeParameters.Count);
+						writer.Write(typeParameterCount);
 					}
 
 					if (ConversionFlags.HasFlag(ConversionFlags.ShowTypeParameterList))