Harden the experimental NFS server a little, by adding extra checks in the readdir functions for non-positive byte count arguments. For the negative case, set it to the maximum allowable, since it was actually a large positive value (unsigned) on the wire. Also, fix up the readdir function comment a bit.
Harden the experimental NFS server a little, by adding extra checks
in the readdir functions for non-positive byte count arguments.
For the negative case, set it to the maximum allowable, since it
was actually a large positive value (unsigned) on the wire.
Also, fix up the readdir function comment a bit.

Suggested by:	dillon AT apollo.backplane.com
MFC after:	2 weeks

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