dmatest: Fix NULL pointer dereference on ioat
device_control is an optional and not implemented in all DMA drivers. Any calls to these will result in a NULL pointer dereference. dmatest makes two of these calls when completing the kernel thread and removing the module. These are corrected by calling the dmaengine_device_control wrapper and checking for a non-existant device_control function pointer there. Signed-off-by: NJon Mason <jon.mason@intel.com> CC: Vinod Koul <vinod.koul@intel.com> CC: Dan Williams <djbw@fb.com> Reviewed-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NVinod Koul <vinod.koul@linux.intel.com>
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