Fix a deadlock in usrsctp_finish
Fix a deadlock in usrsctp_finish

The deadlock occurs when it's running on 2 virtual cores ubuntu machines
with some very specific sequences.

References:
* Discussions on usrsctp, https://github.com/sctplab/usrsctp/issues/325
* Fix commit on usrsctp, https://github.com/sctplab/usrsctp/commit/939d48f9632d69bf170c7a84514b312b6b42257d

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