plugins/query_expanders/tsv: add explicit casts to suppress warnings
plugins/query_expanders/tsv: add explicit casts to suppress warnings

groonga/groonga,groonga/groonga,groonga/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,kenhys/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga