fix the issue that the session's Close method could be invoked multi times#372

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bruce1125 wants to merge 1 commit intotopfreegames:mainfrom

bruce1125:fix/close-session-gracefully

Commits on Dec 4, 2023

fix the issue that the session's Close method could by invoked multi times,and sometimes deletes the new session caused by goroutine SYNC issue
SUSU
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