mpc83xx_spi->irq is unsigned, so the test fails

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
---
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index be15a62..033fd51 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -454,12 +454,12 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
 		goto put_master;
 	}
 
-	mpc83xx_spi->irq = platform_get_irq(dev, 0);
-
-	if (mpc83xx_spi->irq < 0) {
-		ret = -ENXIO;
+	ret = platform_get_irq(dev, 0);
+	if (ret < 0)
 		goto unmap_io;
-	}
+
+	mpc83xx_spi->irq = ret;
+	ret = 0;
 
 	/* Register for SPI Interrupt */
 	ret = request_irq(mpc83xx_spi->irq, mpc83xx_spi_irq,
--
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