pgsql: Fix memory leak during regular expression execution.

Fix memory leak during regular expression execution.

For a regex containing backrefs, pg_regexec() might fail to free all the
sub-DFAs that were created during execution, resulting in a permanent
(session lifespan) memory leak.  Problem was introduced by me in commit
587359479acbbdc95c8e37da40707e37097423f5.  Per report from Sandro Santilli;
diagnosis by Greg Stark.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/473194c09cb294151231374d2628ce624da346ba

Modified Files
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src/backend/regex/regexec.c |    1 +
1 file changed, 1 insertion(+)