Remove unnecessary null check.

src/Workspaces/Core/Portable/Shared/Extensions/ITypeInferenceServiceExtensions.cs

@@ -17,7 +17,7 @@ internal static class ITypeInferenceServiceExtensions
             CancellationToken cancellationToken)
         {
             var types = typeInferenceService.InferTypes(semanticModel, expression, cancellationToken);
-            var delegateTypes = types.Select(t => t?.GetDelegateType(semanticModel.Compilation));
+            var delegateTypes = types.Select(t => t.GetDelegateType(semanticModel.Compilation));
             return delegateTypes.WhereNotNull().FirstOrDefault();
         }