[PATCH v2] fixes warning

[coolrrsh@gmail.com]

From: Rajeshwar R Shinde <coolrrsh@gmail.com>

Typecasting the interrupt number from "unsigned int" to "signed int" to compare with 0(signed int by default).
Declaring interrupt number as "signed int" would violate kernel standards. So typecasting is the possible approach.
The fix is for spi-mpc512x. 

This fixes warning such as:
drivers/spi/spi-mpc512x-psc.c:493:5-13: WARNING: Unsigned expression compared with zero: mps -> irq < 0

Signed-off-by: Rajeshwar R Shinde <coolrrsh@gmail.com>
---
 drivers/spi/spi-mpc512x-psc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c
index 99aeef2..50a4f31 100644
--- a/drivers/spi/spi-mpc512x-psc.c
+++ b/drivers/spi/spi-mpc512x-psc.c
@@ -490,7 +490,7 @@ static int mpc512x_psc_spi_of_probe(struct platform_device *pdev)
 		(struct mpc512x_psc_fifo *)(tempp + sizeof(struct mpc52xx_psc));
 
 	mps->irq = platform_get_irq(pdev, 0);
-	if (mps->irq < 0)
+	if ((int)mps->irq < 0)
 		return mps->irq;
 
 	ret = devm_request_irq(dev, mps->irq, mpc512x_psc_spi_isr, IRQF_SHARED,
-- 
2.25.1