wifi: iwlwifi: mvm: add a debug print when we get a BAR

Getting a BAR can be an explanation if we're chasing packet loss. Add a
print with the relevant debug level in that code path.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230913145231.913e989a1751.I6bff9020e339d91b61b5ad6aede27bcf8c7e6819@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/rxmq.c

@@ -2803,6 +2803,9 @@ void iwl_mvm_rx_bar_frame_release(struct iwl_mvm *mvm, struct napi_struct *napi,
 		 tid))
 		goto out;
 
+	IWL_DEBUG_DROP(mvm, "Received a BAR, expect packet loss: nssn %d\n",
+		       nssn);
+
 	iwl_mvm_release_frames_from_notif(mvm, napi, baid, nssn, queue, 0);
 out:
 	rcu_read_unlock();