[Bug 276363] if_wg: Fix bug in calculate_padding() for the 'p_mtu = 0' case

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276363

--- Comment #5 from commit-hook@FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=bbda52e814e0c760b2beaeae40a2c76ff43d1975

commit bbda52e814e0c760b2beaeae40a2c76ff43d1975
Author:     Aaron LI <aly@aaronly.me>
AuthorDate: 2024-01-17 23:29:23 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2024-01-30 05:37:46 +0000

    if_wg: fix erroneous calculation in calculate_padding() for p_mtu == 0

    In practice this is harmless; only keepalive packets may realistically have
    p_mtu == 0, and they'll also have no payload so the math works out the same
    either way.  Still, let's prefer technical accuracy and calculate the
amount
    of padding needed rather than the padded length...

    PR:             276363

    (cherry picked from commit b891f61ef538a4e9b4658b4b756635c8036a5788)

 sys/dev/wg/if_wg.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

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