spi: ep93xx: use devm_spi_register_master()

Use devm_spi_register_master() to make cleanup paths simpler.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index d22c00a..486fb6d 100644
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -942,7 +942,7 @@
 	/* make sure that the hardware is disabled */
 	ep93xx_spi_write_u8(espi, SSPCR1, 0);
 
-	error = spi_register_master(master);
+	error = devm_spi_register_master(&pdev->dev, master);
 	if (error) {
 		dev_err(&pdev->dev, "failed to register SPI master\n");
 		goto fail_free_dma;
@@ -968,7 +968,6 @@
 
 	ep93xx_spi_release_dma(espi);
 
-	spi_unregister_master(master);
 	return 0;
 }