iwlwifi: introduce iwl_advanced_bt_coexist()

We use priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist
conditional in few places, merge it into one function.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-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-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c
index 12d9363..08f1bea 100644
--- a/drivers/net/wireless/iwlwifi/iwl-scan.c
+++ b/drivers/net/wireless/iwlwifi/iwl-scan.c
@@ -257,8 +257,7 @@
 	queue_work(priv->workqueue, &priv->scan_completed);
 
 	if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
-	    priv->cfg->bt_params &&
-	    priv->cfg->bt_params->advanced_bt_coexist &&
+	    iwl_advanced_bt_coexist(priv) &&
 	    priv->bt_status != scan_notif->bt_status) {
 		if (scan_notif->bt_status) {
 			/* BT on */