Fix more ssize_t issues.
diff --git a/Python/ast.c b/Python/ast.c
index 0b3b485..353514c 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -3034,7 +3034,7 @@
 			if (*s & 0x80) { /* XXX inefficient */
 				PyObject *w;
 				char *r;
-				int rn, i;
+				Py_ssize_t rn, i;
 				w = decode_utf8(&s, end, "utf-16-be");
 				if (w == NULL) {
 					Py_DECREF(u);