Обсуждение: pgsql: Fix null pointer dereference in "\c" psql command.

Fix null pointer dereference in "\c" psql command.

The psql crash happened when no current connection existed.  (The second
new check is optional given today's undocumented NULL argument handling
in PQhost() etc.)  Back-patch to 9.0 (all supported versions).

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/e135c3d99f4fcb03efa7b0b64445853ee2a74857

Modified Files
--------------
src/bin/psql/command.c |    6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)