Correct typo in last line (test program invocation).

Lib/tokenize.py

@@ -190,4 +190,4 @@ def tokenize(readline, tokeneater=printtoken):
 if __name__ == '__main__':                     # testing
     import sys
     if len(sys.argv) > 1: tokenize(open(sys.argv[1]).readline)
-    else: tokenize(syss.tdin.readline)
+    else: tokenize(sys.stdin.readline)