use Ticks not m->ticks.

Reference: /n/atom/patch/applied2013/ilticks
Date: Tue Aug 27 15:30:32 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/ip/il.c	Tue Aug 27 15:30:12 2013
+++ /sys/src/fs/ip/il.c	Tue Aug 27 15:30:13 2013
@@ -3,7 +3,7 @@
 #include "../ip/ip.h"
 
 #define	DEBUG	if(cons.flags&ilflag)print
-#define	msec	(MACHP(0)->ticks * (1000/HZ))
+#define	msec	(Ticks * (1000/HZ))
 
 enum
 {