spi_s3c24xx signedness fix

From: Matthew Wilcox <[email protected]>

Since this one's always in the range 0-255, it could probably be made signed, but it's just as easy to make it work unsigned.

---
 drivers/spi/spi_s3c24xx.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

@@ -125,10 +125,10 @@ static int s3c24xx_spi_setupxfer(struct 
 	/* is clk = pclk / (2 * (pre+1)), or is it
 	 *    clk = (pclk * 2) / ( pre + 1) */
 
-	div = (div / 2) - 1;
+	div /= 2;
 
-	if (div < 0)
-		div = 1;
+	if (div > 0)
+		div -= 1;
 
 	if (div > 255)
 		div = 255;

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