commit 7bb587f4 "dmaengine: add interface of dma_get_slave_channel" introduced
the above error so fix it
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Suggested-by: NZhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>