fix format warnings for kw usb due to change from ulong to uint.

Reference: /n/atom/patch/applied/kwusbnit
Date: Fri Jun  6 17:47:20 CES 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/kw/usbehci.h	Fri Jun  6 17:47:14 2014
+++ /sys/src/9/kw/usbehci.h	Fri Jun  6 17:47:15 2014
@@ -46,8 +46,8 @@
 	int	ntree;		/* number of dummy qhs in tree */
 	Qh*	intrqhs;		/* list of (not dummy) qhs in tree  */
 	Isoio*	iso;		/* list of active Iso I/O */
-	ulong	load;
-	ulong	isoload;
+	uint	load;
+	uint	isoload;
 	int	nintr;		/* number of interrupts attended */
 	int	ntdintr;	/* number of intrs. with something to do */
 	int	nqhintr;	/* number of async td intrs. */