net: mac802154: Add a warning in the slow path

In order to be able to detect possible conflicts between the net
interface core and the ieee802154 core, let's add a warning in the slow
path: we want to be sure that whenever we start an asynchronous MLME
transmission (which can be fully asynchronous) the net core somehow
agrees that this transmission is possible, ie. the device was not
stopped. Warning in this case would allow us to track down more easily
possible issues with the MLME logic if we ever get reports.

Unlike in the hot path, such a situation cannot be handled.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-12-miquel.raynal@bootlin.com


Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>