fix for empty hostnames in mysql users (#20523)

lib/ansible/modules/database/mysql/mysql_user.py

@@ -446,7 +446,7 @@ def privileges_get(cursor, user, host):
             return x
 
     for grant in grants:
-        res = re.match("GRANT (.+) ON (.+) TO '.*'@'.+'( IDENTIFIED BY PASSWORD '.+')? ?(.*)", grant[0])
+        res = re.match("GRANT (.+) ON (.+) TO '.*'@'.*'( IDENTIFIED BY PASSWORD '.+')? ?(.*)", grant[0])
         if res is None:
             raise InvalidPrivsError('unable to parse the MySQL grant string: %s' % grant[0])
         privileges = res.group(1).split(", ")