spi/s3c64xx: Use managed registration

Also improve the error reporting on failure and remove a duplicate put.
This provides a small code saving.
Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/spi/spi-s3c64xx.c

@@ -1428,9 +1428,9 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
 	       S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
 	       sdd->regs + S3C64XX_SPI_INT_EN);
 
-	if (spi_register_master(master)) {
-		dev_err(&pdev->dev, "cannot register SPI master\n");
-		ret = -EBUSY;
+	ret = devm_spi_register_master(&pdev->dev, master);
+	if (ret != 0) {
+		dev_err(&pdev->dev, "cannot register SPI master: %d\n", ret);
 		goto err3;
 	}
 
@@ -1461,16 +1461,12 @@ static int s3c64xx_spi_remove(struct platform_device *pdev)
 
 	pm_runtime_disable(&pdev->dev);
 
-	spi_unregister_master(master);
-
 	writel(0, sdd->regs + S3C64XX_SPI_INT_EN);
 
 	clk_disable_unprepare(sdd->src_clk);
 
 	clk_disable_unprepare(sdd->clk);
 
-	spi_master_put(master);
-
 	return 0;
 }