Update pg_upgrade directory check error message.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e728701fb496ace7fa21fcce5c0ef7fc4c0ec78c

Modified Files
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contrib/pg_upgrade/exec.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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Next:	From: Tom Lane	Date: 2011-05-16 20:42:17
	Subject: pgsql: Fix pg_dump's handling of extension-member casts and languages.
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	Subject: pgsql: Remove redundant privilege doc sentences.