[Patch] um: fix a build error

[WANG Cong]

Fixed this build error:

/home/wangcong/Projects/linux-2.6/arch/um/drivers/line.c: In function
âline_write_interruptâ:
/home/wangcong/Projects/linux-2.6/arch/um/drivers/line.c:366: error:
âstruct tty_ldiscâ has no member named âwrite_wakeupâ
/home/wangcong/Projects/linux-2.6/arch/um/drivers/line.c:367: error:
âstruct tty_ldiscâ has no member named âwrite_wakeupâ
make[2]: *** [arch/um/drivers/line.o] Error 1
make[1]: *** [arch/um/drivers] Error 2
make: *** [sub-make] Error 2

Sigend-off-by: WANG Cong <wangcong@xxxxxxxxx>
Cc: jdike@xxxxxxxxxxx

---
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 5047490..c872dad 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -363,8 +363,8 @@ static irqreturn_t line_write_interrupt(int irq, void *data)
 		return IRQ_NONE;
 
 	if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&
-	   (tty->ldisc.write_wakeup != NULL))
-		(tty->ldisc.write_wakeup)(tty);
+	   (tty->ldisc.ops->write_wakeup != NULL))
+		(tty->ldisc.ops->write_wakeup)(tty);
 
 	/*
 	 * BLOCKING mode
--
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