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ref: 94d1976a4e233bc0f74998482d9660704c7a0047 parent: 5a1aedb622fa15f0d6fb9fbf8306e7cf9312972a author: Sijia Chen <sijchen@cisco.com> date: Tue Mar 3 13:31:37 EST 2015
complete parameter checking related to loop-filter-idc