pgsql: Add missing error check in pgcrypto/crypt-md5.c.
Add missing error check in pgcrypto/crypt-md5.c.
In theory, the second px_find_digest call in px_crypt_md5 could fail
even though the first one succeeded, since resource allocation is
required. Don't skip testing for a failure. (If one did happen,
the likely result would be a crash rather than clean recovery from
an OOM failure.)
The code's been like this all along, so back-patch to all supported