[PATCH] fix m68knommu/68328 serial driver to use work_struct

This patches fixes the m68knommu 68328 serial driver header to use the
work_struct, not the obsoleted workqueue.

drivers/serial/68328serial.h

@@ -161,8 +161,8 @@ struct m68k_serial {
 	int			xmit_head;
 	int			xmit_tail;
 	int			xmit_cnt;
-	struct workqueue	tqueue;
-	struct workqueue	tqueue_hangup;
+	struct work_struct	tqueue;
+	struct work_struct	tqueue_hangup;
 	struct termios		normal_termios;
 	struct termios		callout_termios;
 	wait_queue_head_t	open_wait;