This will make _log_check_warn() exclude the same lines as
_log_check_error() does.
(From OE-Core rev: 85f64c68278f797c6f73f002f63d7f46fe80aef4)
Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>