Fix misspeeld method name (negative)

Lib/test/test_audioop.py

@@ -161,7 +161,7 @@ class TestAudioop(unittest.TestCase):
             self.assertEqual(audioop.getsample(data[1], 2, i), i)
             self.assertEqual(audioop.getsample(data[2], 4, i), i)
 
-    def test_negavitelen(self):
+    def test_negativelen(self):
         # from issue 3306, previously it segfaulted
         self.assertRaises(audioop.error,
             audioop.findmax, ''.join( chr(x) for x in xrange(256)), -2392392)