linux_file.c: Fix handling of NFS getdents() emulation

Bugzilla PR#292282 reports a problem, where a Linux
binary running in the Linuxulator gets bogus entries
in a readdir()/getdents() reply when the directory is
an NFS mount.

This appears to be caused by the NFS client including
entries with d_fileno == 0, which are always ignored by
BSD, but are not ignored by Linux.

This patch filters out the "d_fileno == 0" entries and
the reporter of the bugzilla PR notes that it fixes the
problem for him.

It could be argued that the NFS client should filter out
the "d_fileno == 0" entries, but the NFS client readdir
code is "fragile" and any change to it runs a significant
risk of causing regression type problems.

As such, since the LInuxulator is already broken for this
case, it seems safer to filter them out there.

PR:	292282
Tested by:	Jerry Williams <jwillia3@proton.me>
Reviewed by:	markj
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D54679

0 files changed, 0 insertions, 0 deletions