OMAP: Fix twl4030 keypad bug.

The n_cols number has beed set to the right value in the board specific file,
so in the twl4030 driver, the n_cols doesn't need to plus 1.
Signed-off-by: Stanley.Miao <stanley.miao@windriver.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/input/keyboard/omap-twl4030keypad.c

@@ -174,7 +174,7 @@ static void twl4030_kp_scan(struct omap_keypad *kp, int release_all)
 		if (!changed)
 			continue;
 
-		for (col = 0; col < kp->n_cols + 1; col++) {
+		for (col = 0; col < kp->n_cols; col++) {
 			int key;
 
 			if (!(changed & (1 << col)))