Tweak newly added set_config_sourcefile() so that the target record isn't left corrupt if guc_strdup should fail.
Tweak newly added set_config_sourcefile() so that the target record
isn't left corrupt if guc_strdup should fail.

jmcatamney/gpdb,yuanzhao/gpdb,greenplum-db/gpdb,edespino/gpdb,adam8157/gpdb,jmcatamney/gpdb,lisakowen/gpdb,zeroae/postgres-xl,oberstet/postgres-xl,Chibin/gpdb,50wu/gpdb,xinzweb/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,lisakowen/gpdb,xinzweb/gpdb,arcivanov/postgres-xl,zeroae/postgres-xl,ovr/postgres-xl,50wu/gpdb,jmcatamney/gpdb,edespino/gpdb,xinzweb/gpdb,postmind-net/postgres-xl,snaga/postgres-xl,arcivanov/postgres-xl,edespino/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,snaga/postgres-xl,yuanzhao/gpdb,greenplum-db/gpdb,snaga/postgres-xl,yuanzhao/gpdb,yazun/postgres-xl,adam8157/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,50wu/gpdb,edespino/gpdb,edespino/gpdb,pavanvd/postgres-xl,edespino/gpdb,Chibin/gpdb,ovr/postgres-xl,xinzweb/gpdb,greenplum-db/gpdb,techdragon/Postgres-XL,Chibin/gpdb,snaga/postgres-xl,arcivanov/postgres-xl,Chibin/gpdb,postmind-net/postgres-xl,Chibin/gpdb,kmjungersen/PostgresXL,pavanvd/postgres-xl,kmjungersen/PostgresXL,yuanzhao/gpdb,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,greenplum-db/gpdb,techdragon/Postgres-XL,greenplum-db/gpdb,kmjungersen/PostgresXL,yazun/postgres-xl,Chibin/gpdb,yuanzhao/gpdb,oberstet/postgres-xl,xinzweb/gpdb,tpostgres-projects/tPostgres,zeroae/postgres-xl,adam8157/gpdb,50wu/gpdb,ovr/postgres-xl,snaga/postgres-xl,oberstet/postgres-xl,Postgres-XL/Postgres-XL,tpostgres-projects/tPostgres,ovr/postgres-xl,pavanvd/postgres-xl,kmjungersen/PostgresXL,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,50wu/gpdb,arcivanov/postgres-xl,oberstet/postgres-xl,xinzweb/gpdb,Chibin/gpdb,yuanzhao/gpdb,yazun/postgres-xl,adam8157/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,Chibin/gpdb,arcivanov/postgres-xl,pavanvd/postgres-xl,xinzweb/gpdb,50wu/gpdb,edespino/gpdb,pavanvd/postgres-xl,50wu/gpdb,lisakowen/gpdb,Chibin/gpdb,adam8157/gpdb,jmcatamney/gpdb,tpostgres-projects/tPostgres,postmind-net/postgres-xl,yuanzhao/gpdb,tpostgres-projects/tPostgres,lisakowen/gpdb,adam8157/gpdb,ashwinstar/gpdb,oberstet/postgres-xl,yazun/postgres-xl,edespino/gpdb,lisakowen/gpdb,lisakowen/gpdb,ashwinstar/gpdb,zeroae/postgres-xl,Postgres-XL/Postgres-XL,arcivanov/postgres-xl,jmcatamney/gpdb,yuanzhao/gpdb,ovr/postgres-xl,ashwinstar/gpdb,postmind-net/postgres-xl,edespino/gpdb,ashwinstar/gpdb,xinzweb/gpdb,ashwinstar/gpdb,edespino/gpdb,Postgres-XL/Postgres-XL,zeroae/postgres-xl,50wu/gpdb,ashwinstar/gpdb,techdragon/Postgres-XL,Chibin/gpdb,tpostgres-projects/tPostgres,jmcatamney/gpdb,lisakowen/gpdb,yazun/postgres-xl,adam8157/gpdb,yuanzhao/gpdb,lisakowen/gpdb,kmjungersen/PostgresXL,adam8157/gpdb