tty: Remove !tty condition from __proc_set_tty()

The tty parameter to __proc_set_tty() cannot be NULL; all
call sites have already dereferenced tty.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/tty_io.c

@@ -506,8 +506,8 @@ void proc_clear_tty(struct task_struct *p)
 
 static void __proc_set_tty(struct tty_struct *tty)
 {
-	if (tty) {
 	unsigned long flags;
+
 	/* We should not have a session or pgrp to put here but.... */
 	spin_lock_irqsave(&tty->ctrl_lock, flags);
 	put_pid(tty->session);
@@ -519,7 +519,6 @@ static void __proc_set_tty(struct tty_struct *tty)
 		printk(KERN_DEBUG "tty not NULL!!\n");
 		tty_kref_put(current->signal->tty);
 	}
-	}
 	put_pid(current->signal->tty_old_pgrp);
 	current->signal->tty = tty_kref_get(tty);
 	current->signal->tty_old_pgrp = NULL;