Fix memory leak in coverage_join
Fix memory leak in coverage_join

giantpinkwalrus/fMBT,pombreda/fMBT,mlq/fMBT,CosminNiculae/fMBT,acozzette/fMBT,mixu-/fMBT,pablovirolainen/fMBT,mixu-/fMBT,pyykkis/fMBT,pombreda/fMBT,violep01/fMBT,mixu-/fMBT,yoonkiss/fMBT,pablovirolainen/fMBT,CosminNiculae/fMBT,OMKR/fMBT,mlq/fMBT,pablovirolainen/fMBT,acozzette/fMBT,giantpinkwalrus/fMBT,CosminNiculae/fMBT,heivi/fMBT,mlq/fMBT,yoonkiss/fMBT,rseymour/fMBT,yoonkiss/fMBT,heivi/fMBT,pombreda/fMBT,acozzette/fMBT,acozzette/fMBT,acozzette/fMBT,violep01/fMBT,heivi/fMBT,giantpinkwalrus/fMBT,pyykkis/fMBT,OMKR/fMBT,violep01/fMBT,CosminNiculae/fMBT,mlq/fMBT,pombreda/fMBT,rseymour/fMBT,mixu-/fMBT,rseymour/fMBT,CosminNiculae/fMBT,pombreda/fMBT,mlq/fMBT,heivi/fMBT,heivi/fMBT,OMKR/fMBT,violep01/fMBT,rseymour/fMBT,OMKR/fMBT,heivi/fMBT,rseymour/fMBT,CosminNiculae/fMBT,01org/fMBT,rseymour/fMBT,pablovirolainen/fMBT,pombreda/fMBT,OMKR/fMBT,rseymour/fMBT,OMKR/fMBT,pablovirolainen/fMBT,pyykkis/fMBT,mlq/fMBT,pyykkis/fMBT,pablovirolainen/fMBT,giantpinkwalrus/fMBT,yoonkiss/fMBT,violep01/fMBT,01org/fMBT,pyykkis/fMBT,01org/fMBT,pyykkis/fMBT,CosminNiculae/fMBT,mlq/fMBT,01org/fMBT,yoonkiss/fMBT,heivi/fMBT,pombreda/fMBT,mixu-/fMBT,01org/fMBT,giantpinkwalrus/fMBT