spi: spi-imx: Propagate the real error code on platform_get_irq() failure

No need to return a 'fake' return value on platform_get_irq() failure.

Just return the error code itself instead.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index a5474ef..ad6daf5 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -880,7 +880,7 @@
 
 	spi_imx->irq = platform_get_irq(pdev, 0);
 	if (spi_imx->irq < 0) {
-		ret = -EINVAL;
+		ret = spi_imx->irq;
 		goto out_master_put;
 	}