Fix minor leak in pg_dump
Fix minor leak in pg_dump

Move allocation to after we check the remote server version, to avoid
a possible, very minor, memory leak.  This makes us more consistent
throughout as most places in pg_dump are done in the same way (due, in
part, to previous fixes like this).

Spotted by the Coverity scanner.

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