fix: check err != nil but return a nil value error errRet
#278
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errRet 已经在前面检查了，所以这里一定是 nil，这样直接return 肯定会导致for 循环没执行完，所以这里的本意我认为应该返回 err
I have an idea to detect code that returns a non-relevant nilness error bug. I checked the top 1000 GitHub Go repositories and found this, all result listed in alingse/sundrylint#4