mimxrt/machine_led: Use mp_raise_msg_varg helper.

Signed-off-by: Damien George <damien@micropython.org>

ports/mimxrt/machine_led.c

@@ -44,7 +44,7 @@ STATIC mp_obj_t led_obj_make_new(const mp_obj_type_t *type, size_t n_args, size_
 
     // Check led id is in range
     if (!(1 <= led_id && led_id <= NUM_LEDS)) {
-        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "LED(%d) doesn't exist", led_id));
+        mp_raise_msg_varg(&mp_type_ValueError, "LED(%d) doesn't exist", led_id);
     }
 
     // Return reference to static object