Don't force device creation for pairing failure events

A pairing failure could be caused by switching Bluetooth off or a
disconnect forced by cancelling the pairing attempt so it doesn't make
sense to re-create a device object in these cases.
diff --git a/src/event.c b/src/event.c
index b1054d7..123cb6a 100644
--- a/src/event.c
+++ b/src/event.c
@@ -283,10 +283,16 @@
 {
 	struct btd_adapter *adapter;
 	struct btd_device *device;
+	gboolean create;
 
 	DBG("status=%02x", status);
 
-	if (!get_adapter_and_device(local, peer, &adapter, &device, TRUE))
+	create = status ? FALSE : TRUE;
+
+	if (!get_adapter_and_device(local, peer, &adapter, &device, create))
+		return;
+
+	if (!device)
 		return;
 
 	if (status == 0)
@@ -310,10 +316,16 @@
 {
 	struct btd_adapter *adapter;
 	struct btd_device *device;
+	gboolean create;
 
 	DBG("status=%02x", status);
 
-	if (!get_adapter_and_device(local, peer, &adapter, &device, TRUE))
+	create = status ? FALSE : TRUE;
+
+	if (!get_adapter_and_device(local, peer, &adapter, &device, create))
+		return;
+
+	if (!device)
 		return;
 
 	device_simple_pairing_complete(device, status);