CVE-2025-40164 usbnet: Fix using smp_processor_id() in preemptible code warnings

In the Linux kernel, the following vulnerability has been resolved: usbnet: Fix using smpprocessorid in preemptible code warnings Syzbot reported the following warning: BUG: using smpprocessorid in preemptible 00000000 code: dhcpcd/2879 caller is usbnetskbreturn+0x74/0x490...