wifi: iwlwifi: don't silently ignore missing suspend or resume ops

In case the driver doesn't implement suspend or resume operations
on the transport layer, notify the driver's upper layer.
Otherwise, we might access d3_status uninitialized.
Signed-off-by: Haim Dreyfuss <haim.dreyfuss@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230524203151.0c55e0ca92f1.I6870fe1683215e65d3d036f9b576b03b7b7257be@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/iwl-trans.h

@@ -1160,7 +1160,7 @@ static inline int iwl_trans_d3_suspend(struct iwl_trans *trans, bool test,
 {
 	might_sleep();
 	if (!trans->ops->d3_suspend)
-		return 0;
+		return -EOPNOTSUPP;
 
 	return trans->ops->d3_suspend(trans, test, reset);
 }
@@ -1171,7 +1171,7 @@ static inline int iwl_trans_d3_resume(struct iwl_trans *trans,
 {
 	might_sleep();
 	if (!trans->ops->d3_resume)
-		return 0;
+		return -EOPNOTSUPP;
 
 	return trans->ops->d3_resume(trans, status, test, reset);
 }