spi: tegra20: Simplify with dev_err_probe()

Common pattern of handling deferred probe can be simplified with
dev_err_probe().  Less code and the error value gets printed.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200901152713.18629-11-krzk@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-tegra20-slink.c

@@ -600,13 +600,9 @@ static int tegra_slink_init_dma_param(struct tegra_slink_data *tspi,
 	struct dma_slave_config dma_sconfig;
 
 	dma_chan = dma_request_chan(tspi->dev, dma_to_memory ? "rx" : "tx");
-	if (IS_ERR(dma_chan)) {
-		ret = PTR_ERR(dma_chan);
-		if (ret != -EPROBE_DEFER)
-			dev_err(tspi->dev,
-				"Dma channel is not available: %d\n", ret);
-		return ret;
-	}
+	if (IS_ERR(dma_chan))
+		return dev_err_probe(tspi->dev, PTR_ERR(dma_chan),
+				     "Dma channel is not available\n");
 
 	dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size,
 				&dma_phys, GFP_KERNEL);