[syzbot] upstream build error (20)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    77b1a7f7a05c Merge tag 'mm-nonmm-stable-2023-06-24-19-23' ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1701aabd280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dbdd409f194c6563
dashboard link: https://syzkaller.appspot.com/bug?extid=3ea47fc22e48e9ec4324
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3ea47fc22e48e9ec4324@xxxxxxxxxxxxxxxxxxxxxxxxx

./arch/x86/include/asm/mem_encrypt.h:23:20: error: static declaration of 'mem_encrypt_init' follows non-static declaration

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup