correct mistake on example_poll.cpp#15
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prince02765 wants to merge 1 commit intotencent-wechat:masterfrom
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correct mistake on example_poll.cpp#15prince02765 wants to merge 1 commit intotencent-wechat:masterfrom prince02765:master
prince02765 wants to merge 1 commit intotencent-wechat:masterfrom
prince02765:master