Commit [bda970] Maximize Restore History

Don't treat TMUX_TMPDIR as a potential file

The point of setting TMUX_TMPDIR is to then make any labels from -L go to
that directory. In the case of makesocketpath() with no TMUX_TMPDIR set,
would set both the path and the default socket to a file. The checking of
the permissions on the file worked fine in that case, but when TMUX_TMPDIR
is set, won't work on a directory.

This fixes the problem by ensuring the check on the permissions is performed
on directories only.

Thomas Thomas 2013-09-26

changed tmux.c
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