devlink: fix parallel flash notifications processing

devlink: fix parallel flash notifications processing

Now that it is possible to flash multiple devlink instances in parallel,
the notification processing callback needs to count in the fact that it
receives message that belongs to different devlink instance. So handle
the it gracefully and don't error out.

Reported-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>