fix(vfs): Fix event_write may not exit critical section (IDFGH-11084)

[udoudou]

The judgment conditions for entering the critical section and exiting the critical section in event_write are inconsistent, and there may be a problem of entering the critical section but not exiting the critical section.

[CLAassistant]

All committers have signed the CLA.

[sudeep-mohanty]

Thanks for the contribution @udoudou. Changes LGTM! I shall pull in this change to our internal repository for further tests. Thanks!

[sudeep-mohanty]

sha=369b762b6db7df56f51aaa4e3f73b28be206cd3e

[github-actions]

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