CVE-2025-38441 netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto()

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: account for Ethernet header in nfflowpppoeproto syzbot found a potential access to uninit-value in nfflowpppoeproto Blamed commit forgot the Ethernet header. BUG: KMSAN: uninit-value in...