7.5 /var/log/messages - vfprintf %s NULL in "%.*s"

After upgrading to 7.5 amd64 -stable (and all ports updated) I get
these messages in /var/log/messages. This is with bash from ports
inside tmux over SSH:

tmux: vfprintf %s NULL in "%.*s"
bash: vfprintf %s NULL in "%.*s"
multitail: vfprintf %s NULL in "%.*s"
vim: vfprintf %s NULL in "%.*s"
tmux: vfprintf %s NULL in "%.*s"
bash: vfprintf %s NULL in "%.*s"
multitail: vfprintf %s NULL in "%.*s"
bash: vfprintf %s NULL in "%.*s"
top: vfprintf %s NULL in "%.*s"
top: vfprintf %s NULL in "%.*s"
bash: vfprintf %s NULL in "%.*s"
last message repeated 2 times
irssi: vfprintf %s NULL in "%.*s"
bash: vfprintf %s NULL in "%.*s"
bash: vfprintf %s NULL in "%.*s"
mutt: vfprintf %s NULL in "%.*s"
vim: vfprintf %s NULL in "%.*s"

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Eivind Eide

"ONLY THOSE WHO ATTEMPT THE IMPOSSIBLE WILL ACHIEVE THE ABSURD"
- Oceania Association of Autonomous Astronauts