CVE-2025-38305 ptp: remove ptp->n_vclocks check logic in ptp_vclock_in_use()

In the Linux kernel, the following vulnerability has been resolved: ptp: remove ptp-nvclocks check logic in ptpvclockinuse There is no disagreement that we should check both ptp-isvirtualclock and ptp-nvclocks to check if the ptp virtual clock is in use. However, when we acquire ptp-nvclocksmux t...