all: Use NULL instead of "" when calling mp_raise exception helpers.

This is the established way of doing it and reduces code size by a little
bit.

1 files changed, 1 insertions, 1 deletions

diff --git a/extmod/modutimeq.c b/extmod/modutimeq.c
index 94cbd20d2..620e7484b 100644
--- a/extmod/modutimeq.c
+++ b/extmod/modutimeq.c
@@ -146,7 +146,7 @@ STATIC mp_obj_t mod_utimeq_heappop(mp_obj_t heap_in, mp_obj_t list_ref) {
     }
     mp_obj_list_t *ret = MP_OBJ_TO_PTR(list_ref);
     if (!MP_OBJ_IS_TYPE(list_ref, &mp_type_list) || ret->len < 3) {
-        mp_raise_TypeError("");
+        mp_raise_TypeError(NULL);
     }
 
     struct qentry *item = &heap->items[0];