kernel: netfilter: tproxy: bail out if IP has been disabled on the device

In the Linux kernel, the following vulnerability has been resolved: netfilter: tproxy: bail out if IP has been disabled on the device syzbot reports: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 1 PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range...