mariadb-10.2.9/libmariadb/libmariadb/mariadb_lib.c :3871: possible missing break ?

mariadb-10.2.9/libmariadb/libmariadb/mariadb_lib.c

:3871:8: warning: this statement may fall through [-Wimplicit-fallthrough=]

  case MARIADB_CONNECTION_CLIENT_CAPABILITIES:

    if (mysql)

      *((unsigned long *)arg)= mysql->client_flag;

    else

      goto error;

  default:

    va_end(ap);

    return(-1);