marius ac288bbb4a Avoid a NULL pointer dereference in bounce_bus_dmamap_sync() when the
map has been created via bounce_bus_dmamem_alloc(). Even for coherent
DMA - which bus_dmamem_alloc(9) typically is used for -, calling of
bus_dmamap_sync(9) isn't optional.

PR:		188899 (non-original problem)
MFC after:	3 days
2015-11-20 02:23:35 +00:00
..