Isilon reported that sec=krb5p NFS mounts had a problem when m_len == 0 for the last mbuf of the list with an encrypted message. This patch replaces the KASSERT() with code that handles this case.
Isilon reported that sec=krb5p NFS mounts had a problem when m_len == 0
for the last mbuf of the list with an encrypted message. This patch replaces
the KASSERT() with code that handles this case.

Reported by:	john.gemignani@isilon.com
Reviewed by:	jhb
MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase