[ISSUE #4083] fix for loop, the current loop can not reach the last one in the array

[Hen1ng]

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What is the purpose of the change

fix for loop, the current loop can not reach the last one in the array
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Brief changelog

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  Fixes #
  Fixes The for loop in method org.apache.rocketmq.store.MappedFileQueue#deleteExpiredFileByTime can not reach the last one in the array. #4083