iwlagn: warn only once if AGG state is wrong

This one can be _very_ noisy.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
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-trans-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
index f69aecb..2abd07f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
@@ -1098,7 +1098,7 @@
 		seq_number += 0x10;
 		/* aggregation is on for this <sta,tid> */
 		if (info->flags & IEEE80211_TX_CTL_AMPDU) {
-			WARN_ON(tid_data->agg.state != IWL_AGG_ON);
+			WARN_ON_ONCE(tid_data->agg.state != IWL_AGG_ON);
 			txq_id = tid_data->agg.txq_id;
 			is_agg = true;
 		}