spi: amd: Fix duplicate iounmap in error path

The AMD SPI driver uses devm_ioremap_resource() to map its registers, so
they're automatically unmapped via device_release() when the last ref on
the SPI controller is dropped.  The additional iounmap() in the ->probe()
error path is thus unnecessary.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/497cc38ae2beb7900ae05a1463eb83ff96e2770e.1588590210.git.lukas@wunner.deSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-amd.c

@@ -285,14 +285,12 @@ static int amd_spi_probe(struct platform_device *pdev)
 	err = spi_register_master(master);
 	if (err) {
 		dev_err(dev, "error %d registering SPI controller\n", err);
-		goto err_iounmap;
+		goto err_free_master;
 	}
 	platform_set_drvdata(pdev, amd_spi);
 
 	return 0;
 
-err_iounmap:
-	iounmap(amd_spi->io_remap_addr);
 err_free_master:
 	spi_master_put(master);