Log Message:
-----------
Upon closer inspection, Greg's psql tab completion patch leaks memory.
Fix the leak, and add a comment to note that the return value of
previous_word must be free'd.
Modified Files:
--------------
pgsql/src/bin/psql:
tab-complete.c (r1.128 -> r1.129)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/tab-complete.c.diff?r1=1.128&r2=1.129)
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