Fix more undefined-behaviour inducing overflow checks in struct module.
diff --git a/Lib/test/test_struct.py b/Lib/test/test_struct.py
index 70eed6e..d574bd7 100644
--- a/Lib/test/test_struct.py
+++ b/Lib/test/test_struct.py
@@ -510,6 +510,8 @@
         hugecount = '{}b'.format(sys.maxsize+1)
         self.assertRaises(struct.error, struct.calcsize, hugecount)
 
+        hugecount2 = '{}b{}H'.format(sys.maxsize//2, sys.maxsize//2)
+        self.assertRaises(struct.error, struct.calcsize, hugecount2)
 
     if IS32BIT:
         def test_crasher(self):