Add a crash gurard to pg_encoding_mblen in case of an invalid encoding given.
Add a crash gurard to pg_encoding_mblen in case of an invalid encoding
given.

0x0FFF/gpdb,techdragon/Postgres-XL,kaknikhil/gpdb,50wu/gpdb,Chibin/gpdb,adam8157/gpdb,tpostgres-projects/tPostgres,zaksoup/gpdb,kmjungersen/PostgresXL,adam8157/gpdb,adam8157/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,atris/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,jmcatamney/gpdb,jmcatamney/gpdb,arcivanov/postgres-xl,tangp3/gpdb,yuanzhao/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,snaga/postgres-xl,snaga/postgres-xl,royc1/gpdb,50wu/gpdb,foyzur/gpdb,yazun/postgres-xl,xinzweb/gpdb,chrishajas/gpdb,foyzur/gpdb,Quikling/gpdb,ashwinstar/gpdb,rubikloud/gpdb,zeroae/postgres-xl,zaksoup/gpdb,CraigHarris/gpdb,royc1/gpdb,zaksoup/gpdb,arcivanov/postgres-xl,janebeckman/gpdb,Postgres-XL/Postgres-XL,snaga/postgres-xl,randomtask1155/gpdb,snaga/postgres-xl,cjcjameson/gpdb,greenplum-db/gpdb,ahachete/gpdb,CraigHarris/gpdb,jmcatamney/gpdb,50wu/gpdb,chrishajas/gpdb,royc1/gpdb,edespino/gpdb,edespino/gpdb,Postgres-XL/Postgres-XL,tangp3/gpdb,adam8157/gpdb,lisakowen/gpdb,lisakowen/gpdb,janebeckman/gpdb,lintzc/gpdb,postmind-net/postgres-xl,rubikloud/gpdb,xuegang/gpdb,rvs/gpdb,Postgres-XL/Postgres-XL,chrishajas/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,xuegang/gpdb,adam8157/gpdb,lintzc/gpdb,janebeckman/gpdb,tpostgres-projects/tPostgres,Chibin/gpdb,rvs/gpdb,rubikloud/gpdb,yazun/postgres-xl,greenplum-db/gpdb,Chibin/gpdb,atris/gpdb,lisakowen/gpdb,xinzweb/gpdb,ahachete/gpdb,lintzc/gpdb,zaksoup/gpdb,Quikling/gpdb,rubikloud/gpdb,Postgres-XL/Postgres-XL,royc1/gpdb,cjcjameson/gpdb,Chibin/gpdb,rubikloud/gpdb,randomtask1155/gpdb,yuanzhao/gpdb,lpetrov-pivotal/gpdb,janebeckman/gpdb,Quikling/gpdb,Quikling/gpdb,zaksoup/gpdb,greenplum-db/gpdb,kmjungersen/PostgresXL,ahachete/gpdb,postmind-net/postgres-xl,ashwinstar/gpdb,xuegang/gpdb,lisakowen/gpdb,yuanzhao/gpdb,rubikloud/gpdb,pavanvd/postgres-xl,yuanzhao/gpdb,tangp3/gpdb,postmind-net/postgres-xl,postmind-net/postgres-xl,edespino/gpdb,Quikling/gpdb,0x0FFF/gpdb,tangp3/gpdb,yuanzhao/gpdb,foyzur/gpdb,yuanzhao/gpdb,yuanzhao/gpdb,CraigHarris/gpdb,0x0FFF/gpdb,CraigHarris/gpdb,rvs/gpdb,adam8157/gpdb,tangp3/gpdb,jmcatamney/gpdb,ovr/postgres-xl,tpostgres-projects/tPostgres,lpetrov-pivotal/gpdb,chrishajas/gpdb,lpetrov-pivotal/gpdb,Chibin/gpdb,CraigHarris/gpdb,xuegang/gpdb,arcivanov/postgres-xl,lintzc/gpdb,oberstet/postgres-xl,adam8157/gpdb,zeroae/postgres-xl,atris/gpdb,rvs/gpdb,CraigHarris/gpdb,cjcjameson/gpdb,oberstet/postgres-xl,Quikling/gpdb,Chibin/gpdb,lintzc/gpdb,kaknikhil/gpdb,yazun/postgres-xl,pavanvd/postgres-xl,ahachete/gpdb,50wu/gpdb,royc1/gpdb,50wu/gpdb,kmjungersen/PostgresXL,janebeckman/gpdb,ashwinstar/gpdb,royc1/gpdb,randomtask1155/gpdb,postmind-net/postgres-xl,xuegang/gpdb,xinzweb/gpdb,greenplum-db/gpdb,kaknikhil/gpdb,xuegang/gpdb,rubikloud/gpdb,50wu/gpdb,kaknikhil/gpdb,techdragon/Postgres-XL,xinzweb/gpdb,randomtask1155/gpdb,Chibin/gpdb,rvs/gpdb,tangp3/gpdb,lintzc/gpdb,ahachete/gpdb,CraigHarris/gpdb,xinzweb/gpdb,cjcjameson/gpdb,lpetrov-pivotal/gpdb,0x0FFF/gpdb,arcivanov/postgres-xl,Postgres-XL/Postgres-XL,lpetrov-pivotal/gpdb,cjcjameson/gpdb,xuegang/gpdb,yuanzhao/gpdb,oberstet/postgres-xl,kaknikhil/gpdb,atris/gpdb,CraigHarris/gpdb,Quikling/gpdb,lisakowen/gpdb,cjcjameson/gpdb,tpostgres-projects/tPostgres,ahachete/gpdb,zaksoup/gpdb,ovr/postgres-xl,yuanzhao/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,tpostgres-projects/tPostgres,atris/gpdb,pavanvd/postgres-xl,royc1/gpdb,ashwinstar/gpdb,arcivanov/postgres-xl,edespino/gpdb,jmcatamney/gpdb,tangp3/gpdb,kmjungersen/PostgresXL,lintzc/gpdb,rubikloud/gpdb,xuegang/gpdb,ashwinstar/gpdb,foyzur/gpdb,janebeckman/gpdb,0x0FFF/gpdb,rvs/gpdb,janebeckman/gpdb,foyzur/gpdb,ahachete/gpdb,randomtask1155/gpdb,zeroae/postgres-xl,xuegang/gpdb,50wu/gpdb,chrishajas/gpdb,chrishajas/gpdb,randomtask1155/gpdb,atris/gpdb,kmjungersen/PostgresXL,randomtask1155/gpdb,edespino/gpdb,snaga/postgres-xl,oberstet/postgres-xl,cjcjameson/gpdb,edespino/gpdb,jmcatamney/gpdb,lpetrov-pivotal/gpdb,greenplum-db/gpdb,xinzweb/gpdb,xinzweb/gpdb,Chibin/gpdb,edespino/gpdb,chrishajas/gpdb,royc1/gpdb,yazun/postgres-xl,edespino/gpdb,foyzur/gpdb,lintzc/gpdb,foyzur/gpdb,greenplum-db/gpdb,rvs/gpdb,rvs/gpdb,lintzc/gpdb,lpetrov-pivotal/gpdb,oberstet/postgres-xl,CraigHarris/gpdb,edespino/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,jmcatamney/gpdb,ovr/postgres-xl,foyzur/gpdb,adam8157/gpdb,tangp3/gpdb,ashwinstar/gpdb,lisakowen/gpdb,cjcjameson/gpdb,0x0FFF/gpdb,techdragon/Postgres-XL,kaknikhil/gpdb,chrishajas/gpdb,Chibin/gpdb,xinzweb/gpdb,rvs/gpdb,ahachete/gpdb,arcivanov/postgres-xl,zaksoup/gpdb,janebeckman/gpdb,kaknikhil/gpdb,50wu/gpdb,edespino/gpdb,zeroae/postgres-xl,lpetrov-pivotal/gpdb,janebeckman/gpdb,0x0FFF/gpdb,kaknikhil/gpdb,randomtask1155/gpdb,ovr/postgres-xl,zeroae/postgres-xl,atris/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,Quikling/gpdb,Chibin/gpdb,janebeckman/gpdb,atris/gpdb,rvs/gpdb,ashwinstar/gpdb,yazun/postgres-xl,ashwinstar/gpdb,pavanvd/postgres-xl,Quikling/gpdb,lisakowen/gpdb,Quikling/gpdb,zaksoup/gpdb