CVE-2024-50210 posix-clock: posix-clock: Fix unbalanced locking in pc_clock_settime()

In the Linux kernel, the following vulnerability has been resolved: posix-clock: posix-clock: Fix unbalanced locking in pcclocksettime If getclockdesc succeeds, it calls fget for the clockid's fd, and get the clk-rwsem read lock, so the error path should release the lock to make the lock balance...