linux-next build error (5)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    35394d03 Add linux-next specific files for 20190904
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10a4b1fe600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=743e64ecb0d9ce4e
dashboard link: https://syzkaller.appspot.com/bug?extid=5d7739bb829b8f3b47fa
compiler:       gcc (GCC) 9.0.0 20181231 (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+5d7739bb829b8f3b47fa@xxxxxxxxxxxxxxxxxxxxxxxxx

./include/linux/gpio/driver.h:722:19: error: static declaration of  
âgpiochip_lock_as_irqâ follows non-static declaration

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