Input: w90p910_keypad - move a dereference below a NULL test

We should first check whether platform data is NULL or not, before
dereferencing it to get the keymap.
Signed-off-by: NJulia Lawall <julia@diku.dk>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

drivers/input/keyboard/w90p910_keypad.c

@@ -120,7 +120,7 @@ static int __devinit w90p910_keypad_probe(struct platform_device *pdev)
 {
 	const struct w90p910_keypad_platform_data *pdata =
 						pdev->dev.platform_data;
-	const struct matrix_keymap_data *keymap_data = pdata->keymap_data;
+	const struct matrix_keymap_data *keymap_data;
 	struct w90p910_keypad *keypad;
 	struct input_dev *input_dev;
 	struct resource *res;
@@ -132,6 +132,8 @@ static int __devinit w90p910_keypad_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	keymap_data = pdata->keymap_data;
+
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
 		dev_err(&pdev->dev, "failed to get keypad irq\n");