CVE-2026-90100 ptp: netc: fix period truncation and potential divide-by-zero in PEROUT

In the Linux kernel, the following vulnerability has been resolved: ptp: netc: fix period truncation and potential divide-by-zero in PEROUT The maxperiod bound in nettimerenableperout was computed as: maxperiod = u64NETCTMRDEFAULTFIPER + integralperiod; which exceeds U32MAX when integralperiod 0...