Fix #446: Memory leak in vcf_parser.parse_vcf().
Fix #446: Memory leak in vcf_parser.parse_vcf().

churchlab/millstone,woodymit/millstone_accidental_source,woodymit/millstone,woodymit/millstone,churchlab/millstone,woodymit/millstone_accidental_source,woodymit/millstone,woodymit/millstone,churchlab/millstone,woodymit/millstone_accidental_source,woodymit/millstone_accidental_source,churchlab/millstone