fix memory leak when logical_range_filter returns no records. (#911)
fix memory leak when logical_range_filter returns no records. (#911)


groonga/groonga,kenhys/groonga,komainu8/groonga,groonga/groonga,kenhys/groonga,naoa/groonga,groonga/groonga,naoa/groonga,naoa/groonga,komainu8/groonga,naoa/groonga,komainu8/groonga,kenhys/groonga,naoa/groonga,naoa/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga,kenhys/groonga,komainu8/groonga,naoa/groonga,komainu8/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,groonga/groonga,groonga/groonga,naoa/groonga,groonga/groonga,komainu8/groonga