Input: hideep - switch to use device_property_count_u32()

Use use device_property_count_u32() directly, that makes code neater.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/hideep.c

@@ -811,8 +811,7 @@ static int hideep_init_input(struct hideep_ts *ts)
 	if (error)
 		return error;
 
-	ts->key_num = device_property_read_u32_array(dev, "linux,keycodes",
-						     NULL, 0);
+	ts->key_num = device_property_count_u32(dev, "linux,keycodes");
 	if (ts->key_num > HIDEEP_KEY_MAX) {
 		dev_err(dev, "too many keys defined: %d\n",
 			ts->key_num);