gh-143012: use `Py_ssize_t` cast for `PyBytes_FromStringAndSize` (#143013)

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 221cfc5a93419802f7a5f6267aece1796d25bd6e..e0276ce9e3906faf408bfabe286d0dfbd04290a2 100644 (file)
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -1815,7 +1815,7 @@ convertenviron(void)
 #ifdef MS_WINDOWS
         k = PyUnicode_FromWideChar(*e, (Py_ssize_t)(p-*e));
 #else
-        k = PyBytes_FromStringAndSize(*e, (int)(p-*e));
+        k = PyBytes_FromStringAndSize(*e, (Py_ssize_t)(p-*e));
 #endif
         if (k == NULL) {
             Py_DECREF(d);