Optimize some reput message code

[echooymxq]

• Reuse the DefaultMessageStore.this.getConfirmOffset().
  

  rocketmq/store/src/main/java/org/apache/rocketmq/store/DefaultMessageStore.java

  Lines 2462 to 2465 in 3690049

  	if (DefaultMessageStore.this.getBrokerConfig().isEnableControllerMode()) {
  	return this.reputFromOffset < ((AutoSwitchHAService) DefaultMessageStore.this.haService).getConfirmOffset();
  	}
  	return this.reputFromOffset < DefaultMessageStore.this.commitLog.getMaxOffset();

• Reduce unnecessary branches statement
  

  rocketmq/store/src/main/java/org/apache/rocketmq/store/DefaultMessageStore.java

  Line 2518 in 368d125

  } else if (!dispatchRequest.isSuccess()) {

• Reduce deep branches statement
  

  rocketmq/store/src/main/java/org/apache/rocketmq/store/DefaultMessageStore.java

  Lines 2539 to 2541 in 368d125

  	} else {
  	doNext = false;
  	}