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nusb: handle sub hubs

--- a/sys/src/cmd/nusb/usbd/fns.h

+++ b/sys/src/cmd/nusb/usbd/fns.h

@@ -1,2 +1,3 @@

 int	startdev(Port*);

 void	work(void);

+Hub*	newhub(char *, Dev *);

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

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

@@ -311,6 +311,17 @@

 		fprint(2, "okay what?\n");

 		return -1;

 	}

+	if(d->usb->class == Clhub){

+		/*

+		 * Hubs are handled directly by this process avoiding

+		 * concurrent operation so that at most one device

+		 * has the config address in use.

+		 * We cancel kernel debug for these eps. too chatty.

+		 */

+		if((p->hub = newhub(d->dir, d)) == nil)

+			return -1;

+		return 0;

+	}

 	close(d->dfd);

 	d->dfd = -1;

 	pushevent(formatdev(d));