pgsql: Fix a couple of rather-pointless-but-easily-fixed Coverity

Log Message:
-----------
Fix a couple of rather-pointless-but-easily-fixed Coverity warnings.
Per Martijn van Oosterhout.

Modified Files:
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    pgsql/src/bin/pg_dump:
        pg_backup_archiver.c (r1.126 -> r1.127)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_archiver.c.diff?r1=1.126&r2=1.127)
    pgsql/src/bin/psql:
        prompt.c (r1.43 -> r1.44)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/prompt.c.diff?r1=1.43&r2=1.44)