Bluetooth: Add a convenience function to check for SSP enabled

It's a very common test to see if both the local and the remote device
have SSP enabled. By creating a simple function to test this we can
shorten many if-statements in the code.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index eb198cc..6fb9016 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1270,8 +1270,7 @@
 
 	/* Only request authentication for SSP connections or non-SSP
 	 * devices with sec_level HIGH or if MITM protection is requested */
-	if (!(test_bit(HCI_SSP_ENABLED, &hdev->dev_flags) &&
-			test_bit(HCI_CONN_SSP_ENABLED, &conn->flags)) &&
+	if (!hci_conn_ssp_enabled(conn) &&
 				conn->pending_sec_level != BT_SECURITY_HIGH &&
 				!(conn->auth_type & 0x01))
 		return 0;
@@ -1845,9 +1844,8 @@
 		goto unlock;
 
 	if (!ev->status) {
-		if (!(test_bit(HCI_CONN_SSP_ENABLED, &conn->flags) &&
-				test_bit(HCI_SSP_ENABLED, &hdev->dev_flags)) &&
-				test_bit(HCI_CONN_REAUTH_PEND,	&conn->flags)) {
+		if (!hci_conn_ssp_enabled(conn) &&
+				test_bit(HCI_CONN_REAUTH_PEND, &conn->flags)) {
 			BT_INFO("re-auth of legacy device is not possible.");
 		} else {
 			conn->link_mode |= HCI_LM_AUTH;
@@ -1861,9 +1859,7 @@
 	clear_bit(HCI_CONN_REAUTH_PEND, &conn->flags);
 
 	if (conn->state == BT_CONFIG) {
-		if (!ev->status &&
-				test_bit(HCI_SSP_ENABLED, &hdev->dev_flags) &&
-				test_bit(HCI_CONN_SSP_ENABLED, &conn->flags)) {
+		if (!ev->status && hci_conn_ssp_enabled(conn)) {
 			struct hci_cp_set_conn_encrypt cp;
 			cp.handle  = ev->handle;
 			cp.encrypt = 0x01;