test_faulthandler: fix typo
diff --git a/Lib/test/test_faulthandler.py b/Lib/test/test_faulthandler.py
index 41ccd1e..97dffd2 100644
--- a/Lib/test/test_faulthandler.py
+++ b/Lib/test/test_faulthandler.py
@@ -220,7 +220,7 @@
             """
         not_expected = 'Fatal Python error'
         stderr, exitcode = self.get_output(code)
-        stder = '\n'.join(stderr)
+        stderr = '\n'.join(stderr)
         self.assertTrue(not_expected not in stderr,
                      "%r is present in %r" % (not_expected, stderr))
         self.assertNotEqual(exitcode, 0)