Rick Macklem 778f29833b nfsm_advance() would panic() when the offs argument was negative.
The code assumed that this would indicate a corrupted mbuf chain, but
it could simply be caused by bogus RPC message data.
This patch replaces the panic() with a printf() plus error return.

MFC after:	1 week
2018-11-20 01:56:34 +00:00
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