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
------
REL9_2_STABLE

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

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

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