Bluetooth: trivial: Use preferred method for NULL check

Use standard bluetooth way to check NULL pointer !var instead of
var == NULL.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index 1b88fe4..9d49ee6 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -622,7 +622,7 @@
 	sk_list = PDE(inode)->data;
 	s = __seq_open_private(file, &bt_seq_ops,
 			       sizeof(struct bt_seq_state));
-	if (s == NULL)
+	if (!s)
 		return -ENOMEM;
 
 	s->l = sk_list;
@@ -644,7 +644,7 @@
 	sk_list->fops.release   = seq_release_private;
 
 	pde = proc_net_fops_create(net, name, 0, &sk_list->fops);
-	if (pde == NULL)
+	if (!pde)
 		return -ENOMEM;
 
 	pde->data = sk_list;