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2021-12-23T01:46:03.676366Z
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nfscl: Sanity check the callback tag length

The sanity check for tag length in a callback request
was broken in two ways:

It checked for a negative value, but not a large positive
value.

It did not set taglen to -1, to indicate to the code that
it should not be used.

This patch fixes both of these issues.

PR:	260266

(cherry picked from commit d9931c25617d6625e280fda19bd9c2878e49c091)

Git Hash:   055b230b85cde066eeedd1417e336d2acf6281b9
Git Author: rmacklem@FreeBSD.org
END