sctp: use call_rcu to free endpoint
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.15.13 by commit 75799e71df1da11394740b43ae5686646179561d, it was introduced in version v4.14 by commit d25adbeb0cdb860fb39e09cdd025e9cfc954c5ab. For more details please see the references link.