iwlagn: add "echo test" command to debugfs

For command queue testing, add "echo test" to debugfs

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c
index bcd7f64..bbd6740 100644
--- a/drivers/net/wireless/iwlwifi/iwl-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-rx.c
@@ -47,6 +47,7 @@
 	switch (cmd) {
 		IWL_CMD(REPLY_ALIVE);
 		IWL_CMD(REPLY_ERROR);
+		IWL_CMD(REPLY_ECHO);
 		IWL_CMD(REPLY_RXON);
 		IWL_CMD(REPLY_RXON_ASSOC);
 		IWL_CMD(REPLY_QOS_PARAM);