KAFKA-7811: Avoid unnecessary lock acquire when KafkaConsumer commits offsets (#6119)

Avoid unnecessary lock acquire when KafkaConsumer commits offsets.

Reviewers: Viktor Somogyi-Vass <viktorsomogyi@gmail.com>, Guozhang Wang <wangguoz@gmail.com>

clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java

@@ -1459,12 +1459,7 @@ public class KafkaConsumer<K, V> implements Consumer<K, V> {
      */
     @Override
     public void commitAsync(OffsetCommitCallback callback) {
-        acquireAndEnsureOpen();
-        try {
-            commitAsync(subscriptions.allConsumed(), callback);
-        } finally {
-            release();
-        }
+        commitAsync(subscriptions.allConsumed(), callback);
     }
 
     /**