spi: dw: amend warning message

In case of warning message in ->probe() we have to use HW device name instead
of master because last is not defined yet.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-dw.c

@@ -673,7 +673,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws)
 	if (dws->dma_ops && dws->dma_ops->dma_init) {
 		ret = dws->dma_ops->dma_init(dws);
 		if (ret) {
-			dev_warn(&master->dev, "DMA init failed\n");
+			dev_warn(dev, "DMA init failed\n");
 			dws->dma_inited = 0;
 		}
 	}