CVE-2022-49838 sctp: clear out_curr if all frag chunks of current msg are pruned

In the Linux kernel, the following vulnerability has been resolved: sctp: clear outcurr if all frag chunks of current msg are pruned A crash was reported by Zhen Chen: listdel corruption, ffffa035ddf01c18-next is NULL WARNING: CPU: 1 PID: 250682 at lib/listdebug.c:49 listdelentryvalid+0x59/0xe0...