Update struct format

Author: corona10

Lib/test/test_str.py

@@ -2449,7 +2449,7 @@ def test_expandtabs_optimization(self):
         self.assertIs(s.expandtabs(), s)
 
     def test_raiseMemError(self):
-        asciifields = "nnb"
+        asciifields = "nnbb"
         compactfields = asciifields + "nP"
         ascii_struct_size = support.calcobjsize(asciifields)
         compact_struct_size = support.calcobjsize(compactfields)

Lib/test/test_sys.py

@@ -1762,7 +1762,7 @@ class newstyleclass(object): pass
                    '\u0100'*40, '\uffff'*100,
                    '\U00010000'*30, '\U0010ffff'*100]
         # also update field definitions in test_unicode.test_raiseMemError
-        asciifields = "nnb"
+        asciifields = "nnbb"
         compactfields = asciifields + "nP"
         unicodefields = compactfields + "P"
         for s in samples: