Remove unnecessary PY_SSIZE_T_MAX overflow check for slicelength_bound

Co-authored-by: csm10495 <5749838+csm10495@users.noreply.github.com>
Agent-Logs-Url: https://github.com/csm10495/cpython/sessions/2a4b3921-dacb-4e10-8633-d2bf840cdc99

Author: Copilot

Objects/listobject.c

@@ -3850,18 +3850,12 @@ list_ass_subscript_lock_held(PyObject *_self, PyObject *item, PyObject *value)
                     }
                     return -1;
                 }
-                Py_ssize_t alloc;
-                if (slicelength_bound >= PY_SSIZE_T_MAX) {
-                    alloc = PY_SSIZE_T_MAX;
-                }
-                else {
-                    alloc = slicelength_bound + 1;
-                    if (alloc <= 0) {
-                        /* Zero-length slice; still collect at least
-                           1 item so the size check can detect a
-                           non-empty iterable. */
-                        alloc = 1;
-                    }
+                Py_ssize_t alloc = slicelength_bound + 1;
+                if (alloc <= 0) {
+                    /* Overflow or zero-length slice; still collect at
+                       least 1 item so the size check can detect a
+                       non-empty iterable. */
+                    alloc = 1;
                 }
                 seq = PyList_New(alloc);
                 if (seq == NULL) {