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nusb/usbd: fix dump %U formatter

--- a/sys/src/cmd/nusb/usbd/hub.c

+++ b/sys/src/cmd/nusb/usbd/hub.c

@@ -670,7 +670,7 @@

 	mustdump = 0;

 	for(h = hubs; h != nil; h = h->next)

 		for(i = 1; i <= h->nport; i++)

-			fprint(2, "%s: hub %#p %s port %d: %U",

+			fprint(2, "%s: hub %#p %s port %d: %U\n",

 				argv0, h, h->dev->dir, i, h->port[i].dev);

 }

--- a/sys/src/cmd/nusb/usbd/usbd.c

+++ b/sys/src/cmd/nusb/usbd/usbd.c

@@ -460,6 +460,7 @@

 	busyfd = create("/env/usbbusy", ORCLOSE, 0600);

 	quotefmtinstall();

+	fmtinstall('U', Ufmt);

 	initevent();

 	rfork(RFNOTEG);

 	switch(rfork(RFPROC|RFMEM|RFNOWAIT)){