stream: move abort callback helper out of closure

Author: trivikr

lib/internal/streams/iter/pull.js

@@ -610,6 +610,10 @@ async function* applyValidatedStatefulAsyncTransform(source, transform, options)
   options.signal?.throwIfAborted();
 }
 
+function getOnAbort(reject, signal) {
+  return () => reject(signal.reason);
+}
+
 /**
  * Read one item from an async iterator, rejecting early if the signal aborts.
  * @param {AsyncIterator} iterator - The iterator to read from.
@@ -625,7 +629,7 @@ function abortableNext(iterator, signal) {
 
   const next = iterator.next();
   const { promise, reject } = PromiseWithResolvers();
-  const onAbort = () => reject(signal.reason);
+  const onAbort = getOnAbort(reject, signal);
   signal.addEventListener('abort', onAbort, { __proto__: null, once: true });
   if (signal.aborted) {
     onAbort();