import ITS#3862 fix

CHANGES

@@ -6,6 +6,7 @@ OpenLDAP 2.2.28 Engineering
 	Fixed back-hdb nested modrdn bug (ITS#3857)
 	Fixed back-ldap/meta undefined filter propagation (ITS#3785)
 	Fixed back-ldap/meta rewrite session memory leak
+	Fixed back-ldap abandon leak (ITS#3862)
 	Fixed back-meta add w/o parent add (ITS#3804)
 	Fixed back-meta control propagation bug (ITS#3813)
 	Fixed syncrepl SASL bind crash (ITS#3792)

servers/slapd/back-ldap/search.c

@@ -182,6 +182,9 @@ fail:;
 	{
 		/* check for abandon */
 		if ( op->o_abandon ) {
+			if ( rc > 0 ) {
+				ldap_msgfree( res );
+			}
 			ldap_abandon( lc->ld, msgid );
 			rc = 0;
 			goto finish;