spi: amd: Pass probe errors back to driver core

If probing fails, the AMD SPI driver pretends success to the driver core
by returning 0.  Return the errno instead.
Signed-off-by: NLukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/689f29a359718dab4f5de9ee66c02ea97b3bd9e8.1588590210.git.lukas@wunner.deSigned-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/spi-amd.c

@@ -294,7 +294,7 @@ static int amd_spi_probe(struct platform_device *pdev)
 err_free_master:
 	spi_master_put(master);
 
-	return 0;
+	return err;
 }
 
 static int amd_spi_remove(struct platform_device *pdev)