staging: rtl8712: remove wrapper function _queue_empty

_queue_empty is an inline wrapper around list_empty.  This patch removes this
wrapper function and instead calls list_empty directly.

Signed-off-by: James A Shackleford <shack@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/rtl8712/rtl8712_cmd.c b/drivers/staging/rtl8712/rtl8712_cmd.c
index 4998fde..6151977 100644
--- a/drivers/staging/rtl8712/rtl8712_cmd.c
+++ b/drivers/staging/rtl8712/rtl8712_cmd.c
@@ -410,7 +410,7 @@
 				}
 			}
 			r8712_free_cmd_obj(pcmd);
-			if (_queue_empty(&(pcmdpriv->cmd_queue))) {
+			if (list_empty(&pcmdpriv->cmd_queue.queue)) {
 				r8712_unregister_cmd_alive(padapter);
 				continue;
 			} else