Fix "too many arguments" messages not to index off the end of argv[].

This affects initdb, clusterdb, reindexdb, and vacuumdb in master
and 9.2; in earlier branches, only initdb is affected.

Branch
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/e40b20a3686d2f8f2d8b5f1d82a6b36717d4ab1d

Modified Files
--------------
src/bin/initdb/initdb.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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