pgsql: Fix "too many arguments" messages not to index off the end of ar

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
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REL8_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/63ea46f5db90709032d98819c744881253d933f7

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