Directly commit a compatibility shim for -current. bus_get_dma_tag(dev) in stable is spelled NULL presently.  Until such time as we MFC this functionailty (which may be never), provide this alternate spelling to aide in back-porting -current drivers.  When the functionality is merged, this can be retired.
Directly commit a compatibility shim for -current.
bus_get_dma_tag(dev) in stable is spelled NULL presently.  Until such
time as we MFC this functionailty (which may be never), provide this
alternate spelling to aide in back-porting -current drivers.  When the
functionality is merged, this can be retired.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase