[collector]bugfix:To fix the issue of reusing the adminClient durin…

…g the process of modifying monitoring instances in the Kafka client

hertzbeat-collector/hertzbeat-collector-kafka/src/main/java/org/apache/hertzbeat/collector/collect/kafka/KafkaConnect.java

@@ -61,7 +61,6 @@ public static synchronized AdminClient getAdminClient(String brokerList) {
             properties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, brokerList);
             adminClient = KafkaAdminClient.create(properties);
             preUrl = brokerList;
-            return adminClient;
         }
         return adminClient;
     }