Bluetooth: mgmt: remove NULL check in mgmt_set_connectable_complete()

Remove the cmd pointer NULL check in mgmt_set_connectable_complete()
because it occurs earlier in set_connectable(). This check is also
unnecessary because the pointer is dereferenced just before it.

Found by Linux Verification Center (linuxtesting.org) with Svace.
Signed-off-by: Roman Smirnov <r.smirnov@omp.ru>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

net/bluetooth/mgmt.c

@@ -1707,8 +1707,7 @@ static void mgmt_set_connectable_complete(struct hci_dev *hdev, void *data,
 	new_settings(hdev, cmd->sk);
 
 done:
-	if (cmd)
-		mgmt_pending_remove(cmd);
+	mgmt_pending_remove(cmd);
 
 	hci_dev_unlock(hdev);
 }