Remove superfluous response
Remove superfluous response

In this case, if we can't find or access a directory, the distinction is
irrelevant.  The generic error message would hint that the directory
actually does exist, but is inaccessible for some other reason
(insufficient permissions, etc.). This behavior could have been
leveraged by a malicious user and should be removed.

sstur/nodeftpd,impaler/nodeftpd,oleksiyk/nodeftpd,phillipgreenii/nodeftpd