OpenSSH 6.4, "ssh-add -l", output to non-tty

[Phil Pennock]

On 2014-04-17 at 03:15 -0400, Phil Pennock wrote:
> However, in this scenario, "ssh-add -l" will only produce output to
> stdout if stdout is a tty.

Brain engaged.

stdio buffering, not in line-buffering mode, not flushed before
`fatal()` call.

Obvious in retrospect.  Bug?

-Phil