[PR] Remove the redundant code [rocketmq]

[via GitHub]

wyyl1 opened a new pull request, #7784:
URL: https://github.com/apache/rocketmq/pull/7784

   ### Brief Description
   
   Remove the redundant code because Math.abs does not return negative numbers
   
   ### How Did You Test This Change?
   
   ```java
   @Test
   public void testResultOfResetIsGreaterThanOrEqualToZero() {
       ThreadLocalIndex localIndex = new ThreadLocalIndex();
       localIndex.reset();
       assertThat(localIndex.incrementAndGet() > 0).isTrue();
   }
   ```
   


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