CVE-2023-52704 freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL

In the Linux kernel, the following vulnerability has been resolved: freezer,umh: Fix callusermodehelperexec vs SIGKILL Tetsuo-San noted that commit f5d39b020809 "freezer,sched: Rewrite core freezer logic" broke callusermodehelperexec for the KILLABLE case. Specifically it was missed that the...