wifi: clear wireless secrets tries counter when deactivating

If NM asks for secrets, and then a client calls ActivateDevice on
that same connection, the secrets tries counter doesn't get reset
and NM then thinks we need completely new secrets when we really
don't since the old secrets request isn't valid anymore.

Found by Evan Broder

src/nm-device-wifi.c

@@ -1232,6 +1232,15 @@ real_deactivate_quickly (NMDevice *dev)
 	NMDeviceWifi *self = NM_DEVICE_WIFI (dev);
 	NMDeviceWifiPrivate *priv = NM_DEVICE_WIFI_GET_PRIVATE (self);
 	NMAccessPoint *orig_ap = nm_device_wifi_get_activation_ap (self);
+	NMActRequest *req;
+	NMConnection *connection;
+
+	req = nm_device_get_act_request (dev);
+	if (req) {
+		connection = nm_act_request_get_connection (req);
+		/* Clear wireless secrets tries when deactivating */
+		g_object_set_data (G_OBJECT (connection), WIRELESS_SECRETS_TRIES, NULL);
+	}
 
 	cleanup_association_attempt (self, TRUE);