net/handshake: handshake_genl_notify() shouldn't ignore @flags

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: 3b3009ea

 ("net/handshake: Create a NETLINK service for handling handshake requests")
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>