[PATCH] Expand tilde for UNIX domain socket forwards.

[Todd C. Miller]

I like the idea but tilde_expand_filename() calls fatal() if it
cannot resolve ~foo.  This is not terrible when using -L and -R on
the normal command line but it seems pretty harsh to exit when -L
or -R are used via the ~C escape or the streamlocal-forward at openssh.com
request.
Message-Id: <aea6cdc1d1b42d07 at courtesan.com>

Perhaps we just need a non-fatal version of tilde_expand_filename().
Message-Id: <aea6cdc2c787751c at courtesan.com>

 - todd