Orion Hodson 42e67fd3e7 Apply reference counting patch. Fixes problem of two applications
opening the device, eg one read only and one write only, and the
reference count being non-zero when both exit rendering device
permanently busy.

PR:		kern/35004
Submitted by:	Bill Wells
MFC after:	3 days
2002-08-18 14:17:06 +00:00
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