Fix memory leak in pg_hmac

The intermittent h buffer was not freed, causing it to leak. Backpatch
through 14 where HMAC was refactored to the current API.

Author: Sergey Shinderuk <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]
Backpatch-through: 14

Branch
------
REL_14_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/a5e83ad79c282421f32224c5152d6182de34da35

Modified Files
--------------
src/common/hmac.c | 5 +++++
1 file changed, 5 insertions(+)

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