CVE-2025-38270 net: drv: netdevsim: don't napi_complete() from netpoll

In the Linux kernel, the following vulnerability has been resolved: net: drv: netdevsim: don't napicomplete from netpoll netdevsim supports netpoll. Make sure we don't call napicomplete from it, since it may not be scheduled. Breno reports hitting a warning in napicompletedone: WARNING: CPU: 14...