It is possible that dma_request_chan will return EPROBE_DEFER,
which means that dd->dev is not ready yet. In this case,
dev_err(dd->dev), there will be no output. This patch fixes the bug.
Signed-off-by: Wang Ming <machel@vivo.com>
Reviewed-by: Ryan Wanner <Ryan.Wanner@microchip.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>