Fix Dialyzer warnings in riak_moss_utils.erl
Fix Dialyzer warnings in riak_moss_utils.erl

dragonfax/riak_cs,sdebnath/riak_cs,yangchengjian/riak_cs,GabrielNicolasAvellaneda/riak_cs,basho/riak_cs,basho/riak_cs_report,laurenrother/riak_cs,sdebnath/riak_cs,yangchengjian/riak_cs,basho/riak_cs_lfs,GabrielNicolasAvellaneda/riak_cs,basho/riak_cs,laurenrother/riak_cs,laurenrother/riak_cs,basho/riak_cs,laurenrother/riak_cs,GabrielNicolasAvellaneda/riak_cs,basho/riak_cs,GabrielNicolasAvellaneda/riak_cs,yangchengjian/riak_cs,dragonfax/riak_cs,yangchengjian/riak_cs,sdebnath/riak_cs,sdebnath/riak_cs,dragonfax/riak_cs,dragonfax/riak_cs