Fix #3342: F***ed up null check in MethodVirtualUsedByAnalyzer

Author: siegfriedpammer

ICSharpCode.ILSpyX/Analyzers/Builtin/MethodVirtualUsedByAnalyzer.cs

@@ -47,7 +47,7 @@ public IEnumerable<ISymbol> Analyze(ISymbol analyzedSymbol, AnalyzerContext cont
 			if (analyzedMethod.ParentModule?.MetadataFile == null)
 				yield break;
 
-			if (analyzedMethod.DeclaringTypeDefinition?.MetadataToken.IsNil != true)
+			if (analyzedMethod.DeclaringTypeDefinition?.MetadataToken.IsNil != false)
 				yield break;
 
 			var mapping = context.Language