zlib: Explicit cast to fix a compiler warning

diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index 4b39aae7138de12a41f0c22734ee2733ed866fa6..b40e081a6a1a9098662e37c71d985e808bf22191 100644 (file)
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -573,7 +573,7 @@ save_unconsumed_input(compobject *self, int err)
             Py_ssize_t old_size = PyBytes_GET_SIZE(self->unused_data);
             Py_ssize_t new_size;
             PyObject *new_data;
-            if (self->zst.avail_in > PY_SSIZE_T_MAX - old_size) {
+            if ((Py_ssize_t)self->zst.avail_in > PY_SSIZE_T_MAX - old_size) {
                 PyErr_NoMemory();
                 return -1;
             }