pgsql: Tweak for initdb: if more command-line arguments were specified

Log Message:
-----------
Tweak for initdb: if more command-line arguments were specified than
expected, exit with an error, rather than complaining about the error
on stderr but continuing onward.

Modified Files:
--------------
    pgsql/src/bin/initdb:
        initdb.c (r1.138 -> r1.139)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c.diff?r1=1.138&r2=1.139)