console: fix listing of directory in netfs_get_dirents

Listing /dev/vcs which is translated by /hurd/console gives the following:

 $ ls /dev/vcs
 ls: reading directory '/dev/vcs': Invalid argument
 1 2 3 4 5 6

That error is probably harmless but annoying.

It is caused by netfs_get_dirents the last time it is called during
listing, because it calls mmap with size = 0.

* console/console.c (netfs_get_dirents): Do not call mmap when size is 0.

0 files changed, 0 insertions, 0 deletions