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>

drivers/net/hamradio/6pack.c

@@ -701,7 +701,7 @@ static void sixpack_close(struct tty_struct *tty)
 	sp = tty->disc_data;
 	tty->disc_data = NULL;
 	write_unlock(&disc_data_lock);
-	if (sp == 0)
+	if (!sp)
 		return;
 
 	/*

drivers/net/hamradio/mkiss.c

@@ -821,7 +821,7 @@ static void mkiss_close(struct tty_struct *tty)
 	tty->disc_data = NULL;
 	write_unlock(&disc_data_lock);
 
-	if (ax == 0)
+	if (!ax)
 		return;
 
 	/*