Revert commit 8733bc277a383cf59f38a83956f4f523869cfc90
Author: Mateusz Guzik <mjg@FreeBSD.org>
Date: Thu Sep 14 16:13:01 2023 +0000

vfs: don't provoke recycling non-free vnodes without a good reason

If the total number of free vnodes is at or above target, there is no
point creating more of them.

This commit was done as a performance optimization but ends up
causing slowdowns when doing operations on many files.

Requested by: re (cperciva)
MFC after: 1 minute