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

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SUSE CVE-2025-38305

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...