twl4030: fix potential null pointer dereference

The following patch fix a potential null pointer
dereference in twl4030 keypad driver when parts
of keypad platform_data aren't passed down to the
driver. At that point kp->dbg_dev is not set yet.
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/input/keyboard/omap-twl4030keypad.c

@@ -238,7 +238,7 @@ static int __init omap_kp_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	if (!pdata->rows || !pdata->cols || !pdata->keymap) {
-		dev_err(kp->dbg_dev, "No rows, cols or keymap from pdata\n");
+		dev_err(&pdev->dev, "No rows, cols or keymap from pdata\n");
 		kfree(kp);
 		return -EINVAL;
 	}