iwlwifi: mvm: avoid FW restart while shutting down

iwlwifi: mvm: avoid FW restart while shutting down

If the firmware crashes while we're already shutting down
the system, there isn't much we can do since the shutdown
process is continuing and we wanted to do that. Don't do
a FW restart, with the implied debug collection, in this
case.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210802170640.43a7351ae6bd.I164d48ce4379accf76ea0637983fd946d52dc6f5@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>