Fix detection of short tar files, broken by commit 14ea89366fe321609afc5838ff9fe2ded1cd707d
Fix detection of short tar files, broken by commit 14ea89366fe321609afc5838ff9fe2ded1cd707d

Report by Noah Misch

jmcatamney/gpdb,adam8157/gpdb,adam8157/gpdb,oberstet/postgres-xl,xinzweb/gpdb,pavanvd/postgres-xl,oberstet/postgres-xl,ashwinstar/gpdb,adam8157/gpdb,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,oberstet/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,adam8157/gpdb,ovr/postgres-xl,jmcatamney/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,yazun/postgres-xl,xinzweb/gpdb,ovr/postgres-xl,jmcatamney/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,ashwinstar/gpdb,50wu/gpdb,lisakowen/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,zeroae/postgres-xl,lisakowen/gpdb,50wu/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,zeroae/postgres-xl,ashwinstar/gpdb,ovr/postgres-xl,Postgres-XL/Postgres-XL,pavanvd/postgres-xl,xinzweb/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,50wu/gpdb,adam8157/gpdb,50wu/gpdb,xinzweb/gpdb,xinzweb/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,ovr/postgres-xl,techdragon/Postgres-XL,yazun/postgres-xl,jmcatamney/gpdb,yazun/postgres-xl,yazun/postgres-xl,jmcatamney/gpdb,lisakowen/gpdb,oberstet/postgres-xl,lisakowen/gpdb,Postgres-XL/Postgres-XL,jmcatamney/gpdb,xinzweb/gpdb,50wu/gpdb,greenplum-db/gpdb,adam8157/gpdb,50wu/gpdb,xinzweb/gpdb,zeroae/postgres-xl,ashwinstar/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,techdragon/Postgres-XL,lisakowen/gpdb,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,50wu/gpdb,50wu/gpdb,lisakowen/gpdb,zeroae/postgres-xl,pavanvd/postgres-xl,greenplum-db/gpdb,yazun/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,greenplum-db/gpdb,lisakowen/gpdb,jmcatamney/gpdb