Invoke decRunning() when revertWorker() returns false

[choleraehyq]

Signed-off-by: Cholerae Hu choleraehyq@gmail.com

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name: Pull request
about: Propose changes to the code
title: ''
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1. Are you opening this pull request for bug-fixs, optimizations or new feature?

2. Please describe how these code changes achieve your intention.

3. Please link to the relevant issues (if any).

4. Which documentation changes (if any) need to be made/updated because of this PR?

4. Checklist

• I have squashed all insignificant commits.
• I have commented my code for explaining package types, values, functions, and non-obvious lines.
• I have written unit tests and verified that all tests passes (if needed).
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[choleraehyq]

@panjf2000

[codecov]

Codecov Report

Merging #51 into master will decrease coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
- Coverage    95.5%   95.45%   -0.06%     
==========================================
  Files           5        5              
  Lines         356      352       -4     
==========================================
- Hits          340      336       -4     
  Misses         10       10              
  Partials        6        6

Impacted Files	Coverage Δ
worker.go	100% <100%> (ø)	⬆️
worker_func.go	100% <100%> (ø)	⬆️

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[panjf2000]

@choleraehyq
这个 bug 我理解了，不过麻烦更新一下 PR，把worker_func.go也一并 fix 了，谢谢~

[choleraehyq]

@panjf2000 done

[panjf2000]

有时间看下我的 comment

[panjf2000]

@choleraehyq
Unit tests 失败了

[panjf2000]

看了下代码，应该是 worker 的 defer 体中的

w.pool.decRunning()
w.pool.workerCache.Put(w)

还没执行完成而TestPanicHandler就已经在验证了：

if p1.Running() != 0 {
	t.Errorf("pool should be empty after panic")
}

从而导致了报错。

[choleraehyq]

@panjf2000 done

[panjf2000]

Fixed #50