[PATCH] tty: use NULL for ptrs

Fix sparse warning in tty_io:
drivers/char/tty_io.c:1536:34: warning: Using plain integer as NULL pointer

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index df467284ff4e..f24c26d2dba1 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1533,7 +1533,7 @@ void disassociate_ctty(int on_exit)
 
         spin_lock_irq(&current->sighand->siglock);
         tty_pgrp = current->signal->tty_old_pgrp;
-        current->signal->tty_old_pgrp = 0;
+        current->signal->tty_old_pgrp = NULL;
         spin_unlock_irq(&current->sighand->siglock);
         put_pid(tty_pgrp);