all: Remove unnecessary locals_dict cast.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

py/objgenerator.c

@@ -376,5 +376,5 @@ MP_DEFINE_CONST_OBJ_TYPE(
     unary_op, mp_generic_unary_op,
     getiter, mp_identity_getiter,
     iternext, gen_instance_iternext,
-    locals_dict, (mp_obj_dict_t *)&gen_instance_locals_dict
+    locals_dict, &gen_instance_locals_dict
     );