`ssh-add -m` exit value always =/= 0?

[René J . V . Bertin]

Hi,

Does `${prefix}/ssh-add -m` always return a non-zero value, or is it trying to 
tell me I have an error condition somewhere?

It does this regardless of whether I have the system or MacPorts's ssh-agent 
running; the equivalent `/usr/bin/ssh-add -A` command exits with 0 under the 
same conditions.

Thanks,
R.