py/mpz: Do sign extension in mpz_as_bytes for negative values.

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

1 files changed, 0 insertions, 1 deletions

diff --git a/py/objint_mpz.c b/py/objint_mpz.c
index 6e52073a6..ef3e01796 100644
--- a/py/objint_mpz.c
+++ b/py/objint_mpz.c
@@ -116,7 +116,6 @@ mp_obj_t mp_obj_int_from_bytes_impl(bool big_endian, size_t len, const byte *buf
 void mp_obj_int_to_bytes_impl(mp_obj_t self_in, bool big_endian, size_t len, byte *buf) {
     assert(mp_obj_is_type(self_in, &mp_type_int));
     mp_obj_int_t *self = MP_OBJ_TO_PTR(self_in);
-    memset(buf, 0, len);
     mpz_as_bytes(&self->mpz, big_endian, len, buf);
 }