trasz ec4d9aa4a2 Avoid dereferencing NULL pointers in devtoname(). I've seen it panic,
called from ufs_print() in DDB.

MFC after:	1 month
2016-12-12 15:22:21 +00:00
..
2016-12-09 15:05:09 +00:00
2016-11-28 21:16:03 +00:00
2016-11-26 23:15:11 +00:00
2016-12-10 03:31:38 +00:00