NULL noise in drivers/net

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index 580cb4a..0a9b751 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -701,7 +701,7 @@
 	sp = tty->disc_data;
 	tty->disc_data = NULL;
 	write_unlock(&disc_data_lock);
-	if (sp == 0)
+	if (!sp)
 		return;
 
 	/*