Don't call user operator for null check of HttpMethod value (#40306)

diff --git a/src/libraries/System.Net.Http/src/System/Net/Http/HttpRequestMessage.cs b/src/libraries/System.Net.Http/src/System/Net/Http/HttpRequestMessage.cs
index 83ee09f..5e1d9bb 100644 (file)
--- a/src/libraries/System.Net.Http/src/System/Net/Http/HttpRequestMessage.cs
+++ b/src/libraries/System.Net.Http/src/System/Net/Http/HttpRequestMessage.cs
@@ -167,7 +167,7 @@ namespace System.Net.Http
         [MemberNotNull(nameof(_version))]
         private void InitializeValues(HttpMethod method, Uri? requestUri)
         {
-            if (method == null)
+            if (method is null)
             {
                 throw new ArgumentNullException(nameof(method));
             }