dgnc: break-related ioctls won't reach ->ioctl()

kill the dead code, especially since ->break_ctl() will do the
right thing anyway.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

drivers/staging/dgnc/dgnc_tty.c

@@ -2081,81 +2081,6 @@ static int dgnc_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
 
 	switch (cmd) {
 	/* Here are all the standard ioctl's that we MUST implement */
-
-	case TCSBRK:
-		/*
-		 * TCSBRK is SVID version: non-zero arg --> no break
-		 * this behaviour is exploited by tcdrain().
-		 *
-		 * According to POSIX.1 spec (7.2.2.1.2) breaks should be
-		 * between 0.25 and 0.5 seconds so we'll ask for something
-		 * in the middle: 0.375 seconds.
-		 */
-		rc = tty_check_change(tty);
-		spin_unlock_irqrestore(&ch->ch_lock, flags);
-		if (rc)
-			return rc;
-
-		rc = ch_bd_ops->drain(tty, 0);
-		if (rc)
-			return -EINTR;
-
-		spin_lock_irqsave(&ch->ch_lock, flags);
-
-		if (((cmd == TCSBRK) && (!arg)) || (cmd == TCSBRKP))
-			ch_bd_ops->send_break(ch, 250);
-
-		spin_unlock_irqrestore(&ch->ch_lock, flags);
-
-		return 0;
-
-	case TCSBRKP:
-		/*
-		 * support for POSIX tcsendbreak()
-		 * According to POSIX.1 spec (7.2.2.1.2) breaks should be
-		 * between 0.25 and 0.5 seconds so we'll ask for something
-		 * in the middle: 0.375 seconds.
-		 */
-		rc = tty_check_change(tty);
-		spin_unlock_irqrestore(&ch->ch_lock, flags);
-		if (rc)
-			return rc;
-
-		rc = ch_bd_ops->drain(tty, 0);
-		if (rc)
-			return -EINTR;
-
-		spin_lock_irqsave(&ch->ch_lock, flags);
-
-		ch_bd_ops->send_break(ch, 250);
-
-		spin_unlock_irqrestore(&ch->ch_lock, flags);
-
-		return 0;
-
-	case TIOCSBRK:
-		rc = tty_check_change(tty);
-		spin_unlock_irqrestore(&ch->ch_lock, flags);
-		if (rc)
-			return rc;
-
-		rc = ch_bd_ops->drain(tty, 0);
-		if (rc)
-			return -EINTR;
-
-		spin_lock_irqsave(&ch->ch_lock, flags);
-
-		ch_bd_ops->send_break(ch, 250);
-
-		spin_unlock_irqrestore(&ch->ch_lock, flags);
-
-		return 0;
-
-	case TIOCCBRK:
-		/* Do Nothing */
-		spin_unlock_irqrestore(&ch->ch_lock, flags);
-		return 0;
-
 	case TIOCGSOFTCAR:
 
 		spin_unlock_irqrestore(&ch->ch_lock, flags);