dma: sh: Don't use ENODEV for failing slave lookup

commit 7c1119bd upstream.

If dmaengine driver's .device_alloc_chan_resources() method returns -ENODEV,
dma_request_channel() will decide, that the driver has been removed and will
remove the device from its list. To prevent this use ENXIO if a slave lookup
fails.
Reported-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/dma/sh/shdma.c

@@ -326,7 +326,7 @@ static int sh_dmae_set_slave(struct shdma_chan *schan,
 						    shdma_chan);
 	const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id);
 	if (!cfg)
-		return -ENODEV;
+		return -ENXIO;
 
 	if (!try)
 		sh_chan->config = cfg;