gh-126461: Fix _Unpickler_ReadFromFile() error handling (GH-126485)

Handle _Unpickler_SetStringInput() failure.
(cherry picked from commit a1c57bc)

Co-authored-by: Victor Stinner <[email protected]>

Author: vstinner

Modules/_pickle.c

@@ -1287,6 +1287,10 @@ _Unpickler_ReadFromFile(UnpicklerObject *self, Py_ssize_t n)
             else {
                 read_size = _Unpickler_SetStringInput(self, data);
                 Py_DECREF(data);
+                if (read_size < 0) {
+                    return -1;
+                }
+
                 self->prefetched_idx = 0;
                 if (n <= read_size)
                     return n;