nfscl: Sanity check the Sequence slotid in reply

The slotid in the Sequence reply must be the same as
in the request. Check that it is the same and log
a console message if it is not, plus set it to the
correct value.

Reported by: rtm@lcs.mit.edu
Tested by: rtm@lcs.mit.edu
PR: 260071
MFC after: 2 weeks