Replace strdup() with pstrdup(), to avoid leaking memory.

It's been like this since the seg module was introduced, so backpatch to
8.2 which is the oldest supported version.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/ea896da394cbb0fb32a4b41065ea04b81c4b03f6

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

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Next:	From: Heikki Linnakangas	Date: 2011-05-19 02:50:03
	Subject: pgsql: Replace strdup() with pstrdup(), to avoid leaking memory.
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