K 10
svn:author
V 6
marius
K 8
svn:date
V 27
2015-11-21T02:08:47.994927Z
K 7
svn:log
V 313
Avoid a NULL pointer dereference in bounce_bus_dmamap_unload() when
the map has been created via bounce_bus_dmamem_alloc(). In that case
bus_dmamap_unload(9) typically isn't called during normal operation
but still should be during detach, cleanup from failed attach etc.

Submitted by:	yongari
MFC after:	3 days

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