Fix very minor memory leaks in psql's command.c.
\drds leaked its second pattern argument if any, and \connect leaked
any empty-string or "-" arguments. These are old bugs, but it's hard
to imagine any real use-case where the leaks could amount to anything
meaningful, so not bothering with a back-patch.
Daniel Gustafsson and Tom Lane
Discussion: https://postgr.es/m/
3641F19B-336A-431A-86CE-
A80562505C5E@yesql.se