Ariff Abdullah 9c271f79d6 Insert NULL pointer checking around devclass_get_maxunit(pcm_devclass, ..) .
Things can get ugly without it due to uninitialized class. RELENG_6 need
a simmilar, but different treatment as well.

err.. perhaps we should teach devclass_get_maxunit() to return -1 ?

MFC after:	1 day
2007-06-03 10:56:22 +00:00
..