iwlagn: store the irq number to iwl_bus just like dev

Since the irq number is just an unsigned int, store it inside iwl_bus
instead of calling the get_irq ops every time it is needed.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.h b/drivers/net/wireless/iwlwifi/iwl-agn.h
index 848a6c3..6d5584a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.h
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.h
@@ -125,7 +125,7 @@
 static inline void iwl_synchronize_irq(struct iwl_priv *priv)
 {
 	/* wait to make sure we flush pending tasklet*/
-	synchronize_irq(priv->bus.ops->get_irq(&priv->bus));
+	synchronize_irq(priv->bus.irq);
 	tasklet_kill(&priv->irq_tasklet);
 }