stmhal: Fix HAL error raising; make test for it.

Addresses issue #968.

1 files changed, 1 insertions, 1 deletions

diff --git a/stmhal/mphal.c b/stmhal/mphal.c
index e8f242051..7fcd982dc 100644
--- a/stmhal/mphal.c
+++ b/stmhal/mphal.c
@@ -16,5 +16,5 @@ const byte mp_hal_status_to_errno_table[4] = {
 };
 
 NORETURN void mp_hal_raise(HAL_StatusTypeDef status) {
-    nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, (mp_obj_t)(mp_uint_t)mp_hal_status_to_errno_table[status]));
+    nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(mp_hal_status_to_errno_table[status])));
 }