Fixed:

• microService_AddEndpoint() could crash if subject is invalid #831
• deadlock in js_MaybeFetchMore #834
• double free and deref after free in js.c#839
• some nulls checks #840
• typo in clear routine #842
• better cleanup if js clone config fails #844
• possible null deref #848
• srvpool typo #849

Full Changelog: https://github.com/nats-io/nats.c/compare/v3.9.2...v3.9.3