One caller, _filemon_wrapper_openat(),Most fget*() functions initialize the output parameter to NULL. assumes that getvnode() leavesMake them
*fpp unmodified if an error was returned. fget*() have this property.all behave consistently. This fixes at least one bug in a consumer,
Let's make getvnode() behave the same way_filemon_wrapper_openat().
Reported by: syzbot+01c0459408f896a5933a@syzkaller.appspotmail.com