[PATCH] elimination of code duplication in DefineOpFamily()

It looks like for me the bottom half of the DefineOpFamily() is
a block copied and pasted from CreateOpFamily().
It has identical logic, variable names and source code comments.

Perhaps, we can replace this code block by CreateOpFamily() call.

Thanks,
--
KaiGai Kohei <kaigai@ak.jp.nec.com>