Use dma_request_chan instead of dma_request_slave_channel,
in this case we can check EPROBE_DEFER without static
warning.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NShawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: NDouglas Anderson <dianders@chromium.org>
Signed-off-by: NMark Brown <broonie@kernel.org>