iwlwifi: add context into tx descriptor

In status processing we'll need to find the context
for a given frame, so add a context pointer to the
TX info for each frame.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h
index 01a654e..90bf6b3 100644
--- a/drivers/net/wireless/iwlwifi/iwl-dev.h
+++ b/drivers/net/wireless/iwlwifi/iwl-dev.h
@@ -144,6 +144,7 @@
 /* One for each TFD */
 struct iwl_tx_info {
 	struct sk_buff *skb;
+	struct iwl_rxon_context *ctx;
 };
 
 /**