Bug#1040311: openssh: ssh-keygen -C '' creates trailing whitespace in pubkeys

Source: openssh
Version: 1:9.2p1-2
Severity: normal

Dear Maintainer,

If you run:
$ ssh-keygen -f "testkey" -C ''

It creates a public key file testkey.pub with a trailing space:
$ grep ' $' testkey.pub

The -C '' option is supposed to mean "don't add any comment at the end of the pubkey".

Please forward this upstream to fix.

-- System Information:
Debian Release: 12.0
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-9-amd64 (SMP w/1 CPU thread; PREEMPT)
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled