bpo-30281: Fix the default value for stop in PySlice_Unpack() (#1480) (#1529)

diff --git a/Python/ceval.c b/Python/ceval.c
index bce86ab..5dc0444 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -5071,7 +5071,7 @@
 /* Extract a slice index from a PyLong or an object with the
    nb_index slot defined, and store in *pi.
    Silently reduce values larger than PY_SSIZE_T_MAX to PY_SSIZE_T_MAX,
-   and silently boost values less than -PY_SSIZE_T_MAX-1 to -PY_SSIZE_T_MAX-1.
+   and silently boost values less than PY_SSIZE_T_MIN to PY_SSIZE_T_MIN.
    Return 0 on error, 1 on success.
 */
 int