cygport SSH_KEY variable

[Ken Brown]

According to the documentation of SSH_KEY, "You'll need to set this if 
your private key isn't already loaded into a running ssh-agent(1), and 
it doesn't have one of the expected file names such as ~/.ssh/id_rsa." 
But I don't see in the source that cygport checks for one of the 
expected file names.  Is this a cygport bug or just a documentation bug?

Ken