[PATCH] missing include in hisax

Missing include, breaks at least on arm.

Signed-off-by: Al Viro <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/isdn/hisax/hfc4s8s_l1.c b/drivers/isdn/hisax/hfc4s8s_l1.c
index 1ac46c2..ba1d028 100644
--- a/drivers/isdn/hisax/hfc4s8s_l1.c
+++ b/drivers/isdn/hisax/hfc4s8s_l1.c
@@ -29,6 +29,7 @@
 #include <linux/timer.h>
 #include <linux/skbuff.h>
 #include <linux/wait.h>
+#include <asm/io.h>
 #include "hisax_if.h"
 #include "hfc4s8s_l1.h"