[Net::FTPServer] lstat patch

[Attila Babo]

On OpenBSD 3.5 lstat returns $dev as 0, these patches helps to get
correct file and directory information.

lib/Net/FTPServer/Full/DirHandle.pm
235c235
>     return ("d", 0000, 1, "-", "-", 0, 0) unless $dev;
---
<     return ("d", 0000, 1, "-", "-", 0, 0) unless defined $dev;


lib/Net/FTPServer/Full/FileHandle.pm
>     return ("f", 0000, 1, "-", "-", 0, 0) unless $dev;
---
<     return ("f", 0000, 1, "-", "-", 0, 0) unless defined $dev;