Fix an error in psql that overcounted output lines.
Fix an error in psql that overcounted output lines.

This error counted the first line of a cell as "extra". The effect was
to cause far too frequent invocation of the pager. In most cases this
can be worked around (for example, by using the "less" pager with the -F
flag), so don't backpatch.

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