Fix a panic that a priority value which is passed to cv_broadcastpri(9) can be < 0.  We don't ignore a `increment' argument but at least we keep a priority value of NDIS threads over PRI_MIN_KERN.
Fix a panic that a priority value which is passed to cv_broadcastpri(9)
can be < 0.  We don't ignore a `increment' argument but at least we keep
a priority value of NDIS threads over PRI_MIN_KERN.

Reviewed by:	thompsa

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