Log Message:-----------Make saveHistory work properly on OS X when HISTFILE is set to /dev/null.Per discussion with Martin Atukunda.
Modified Files:-------------- pgsql/src/bin/psql: input.c (r1.57 -> r1.58) (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/input.c.diff?r1=1.57&r2=1.58)
