[2.6 patch] drivers/char/n_hdlc.c: fix check-after-use

[2.6 patch] drivers/char/n_hdlc.c: fix check-after-use

[Adrian Bunk]

The Coverity checker spotted that we'd have already oops'ed if "tty"
was NULL.

Since "tty" can't be NULL when we reach this line of code this patch 
removes the NULL check.

Signed-off-by: Adrian Bunk <bunk@kernel.org>

---
--- linux-2.6.23-rc1-mm2/drivers/char/n_hdlc.c.old	2007-08-08 06:11:02.000000000 +0200
+++ linux-2.6.23-rc1-mm2/drivers/char/n_hdlc.c	2007-08-08 06:11:15.000000000 +0200
@@ -220,25 +220,25 @@
 static void n_hdlc_release(struct n_hdlc *n_hdlc)
 {
 	struct tty_struct *tty = n_hdlc2tty (n_hdlc);
 	struct n_hdlc_buf *buf;
 	
 	if (debuglevel >= DEBUG_LEVEL_INFO)	
 		printk("%s(%d)n_hdlc_release() called\n",__FILE__,__LINE__);
 		
 	/* Ensure that the n_hdlcd process is not hanging on select()/poll() */
 	wake_up_interruptible (&tty->read_wait);
 	wake_up_interruptible (&tty->write_wait);
 
-	if (tty != NULL && tty->disc_data == n_hdlc)
+	if (tty->disc_data == n_hdlc)
 		tty->disc_data = NULL;	/* Break the tty->n_hdlc link */
 
 	/* Release transmit and receive buffers */
 	for(;;) {
 		buf = n_hdlc_buf_get(&n_hdlc->rx_free_buf_list);
 		if (buf) {
 			kfree(buf);
 		} else
 			break;
 	}
 	for(;;) {
 		buf = n_hdlc_buf_get(&n_hdlc->tx_free_buf_list);