iio: apds9960: light: fix simple_return.cocci warnings

drivers/iio/light/apds9960.c:986:1-4: WARNING: end returns can be simpified

 Simplify a trivial if-return sequence.  Possibly combine with a
 preceding function call.

Generated by: scripts/coccinelle/misc/simple_return.cocci

CC: Matt Ranostay <mranostay@gmail.com>
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/light/apds9960.c

@@ -983,11 +983,7 @@ static int apds9960_chip_init(struct apds9960_data *data)
 	if (ret)
 		return ret;
 
-	ret = apds9960_set_powermode(data, 1);
-	if (ret)
-		return ret;
-
-	return 0;
+	return apds9960_set_powermode(data, 1);
 }
 
 static int apds9960_probe(struct i2c_client *client,