src: apply clang-tidy readability-delete-null-pointer

PR-URL: #26813
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

src/js_native_api_v8.cc

@@ -395,9 +395,7 @@ struct CallbackBundle {
     // This will be called when the v8::External containing `this` pointer
     // is being GC-ed.
     CallbackBundle* bundle = info.GetParameter();
-    if (bundle != nullptr) {
-      delete bundle;
-    }
+    delete bundle;
   }
 };