net build error

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    474ff2600889 net-ethtool: ETHTOOL_GUFO did not and should ..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=164c4059400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5fa12be50bca08d8
dashboard link: https://syzkaller.appspot.com/bug?extid=a72ba31e3224309179d4
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a72ba31e3224309179d4@xxxxxxxxxxxxxxxxxxxxxxxxx



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