[Bug 286178] wg: wg-quick up broken after base 7121e9414f29

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286178

            Bug ID: 286178
           Summary: wg: wg-quick up broken after base 7121e9414f29
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
               URL: https://cgit.freebsd.org/src/commit/?id=7121e9414f29
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: 2khramtsov@gmail.com
                CC: kevans@freebsd.org

main as of 7121e9414f29 ("wg: Improve wg_peer_alloc() to simplify the calling")
has the following issue:

# wg-quick up wg0
[#] ifconfig wg create name wg0
[#] wg setconf wg0 /dev/stdin
[#] ifconfig wg0 inet6 2001:db8:100::1/48 alias
ifconfig: ioctl (SIOCAIFADDR): File exists
[#] ifconfig wg0 destroy

Reverting base 7121e9414f29 ("wg: Improve wg_peer_alloc() to simplify the
calling")
restores expected behavior for me.

I have in rc.conf.local:

wireguard_enable="YES"
wireguard_interfaces="wg0 wg1"

wg0.conf:

[Interface]
PrivateKey = [cut]
Address = 2001:db8:100::1/48
ListenPort = 51280
Table = off
PostUp = /usr/local/etc/wireguard/wg0-up.sh
PostDown = /usr/local/etc/wireguard/wg0-down.sh

[Peer]
PublicKey = [cut]
Endpoint = [IPv6-literal-GUA-address]:51820
AllowedIPs = 2000::/3
PersistentKeepalive = 10

wg1.conf:

[Interface]
PrivateKey = [cut]
ListenPort = 42
MTU = 1412
Table = off
PostUp = /usr/local/etc/wireguard/wg1-up.sh
PostDown = /usr/local/etc/wireguard/wg1-down.sh

[Peer]
PublicKey = [cut]
AllowedIPs = 3fff:db8:101:1001::/64

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