Review Request 35686: Change the if statement to a CHECK at the end of _runTask.

[Michael Park]

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Review request for mesos and Jie Yu.


Repository: mesos


Description
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Follow-up from [r35433](https://reviews.apache.org/r/35433/#comment141187).


Diffs
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  src/slave/slave.cpp e73913b072e323033a81e64b5345cb9457137e3e 

Diff: https://reviews.apache.org/r/35686/diff/


Testing
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`make check`


Thanks,

Michael Park