Most fget*() functions initialize the output parameter to NULL. Make
the externally visible interface behave consistently, and make
fget_unlocked_seq() private to kern_descrip.c.
This fixes at least one bug in a consumer, _filemon_wrapper_openat(),
which assumes that getvnode() sets the output file pointer to NULL upon
an error.
Reported by: syzbot+01c0459408f896a5933a@syzkaller.appspotmail.com
Reviewed by: kib
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D34190
300cfb96fc