check-code: Only call check-code if __name__ = "__main__".

This changeset moves the code that actually executes something to the
"if __name__ = '__main__'" section to allow the file to be imported as
a module.

contrib/check-code.py

@@ -134,6 +134,7 b' checks = ['
     ('c', r'.*\.c$', cfilters, cpats),
 ]
 
+if __name__ == "__main__":
 if len(sys.argv) == 1:
     check = glob.glob("*")
 else: