iwlagn: extend notification wait function

A notification wait function is called with the
command, but currently has no way of passing
data back to the caller -- fix that by adding a
void pointer to the function that can be used
between the caller and the function.

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-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index e99cd94..a9204db 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -769,7 +769,7 @@
 				if (w->cmd == pkt->hdr.cmd) {
 					w->triggered = true;
 					if (w->fn)
-						w->fn(priv, pkt);
+						w->fn(priv, pkt, w->fn_data);
 				}
 			}
 			spin_unlock(&priv->_agn.notif_wait_lock);