It turns out that the majority of the callers do not set fid in the sstb. So it can cause problem if it happens to be SLFID_ROOT.  It will pollute the fcmh cache.
It turns out that the majority of the callers do not set fid in the sstb.
So it can cause problem if it happens to be SLFID_ROOT.  It will pollute
the fcmh cache.

The problem was spotted by Jared. It has been there for three years.

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable