freeing LDAPMessage in CheckLDAPAuth

Hi,
In CheckLDAPAuth(), around line 2606:

if (r != LDAP_SUCCESS)
{
ereport(LOG,
(errmsg("could not search LDAP for filter \"%s\" on
server \"%s\": %s",

It seems that the call to ldap_msgfree() is missing in the above case.
According to
https://www.openldap.org/software//man.cgi?query=ldap_search_s&sektion=3&apropos=0&manpath=OpenLDAP+2.4-Release
:

Note that *res* parameter of *ldap*_*search*_*ext*_*s()*
and *ldap*_*search*_*s()*
should be freed with *ldap*_*msgfree()* regardless of return
value of these
functions.

Please see the attached patch which frees the search_message in the above case.

Thanks