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nusb/lib: do not retry port status requests

We want the hub to detect a failed hub as soon as possible,
to not delay device detaches.

--- a/sys/src/cmd/nusb/lib/dev.c

+++ b/sys/src/cmd/nusb/lib/dev.c

@@ -449,6 +449,13 @@

 			if(r == 0)

 				werrstr("no data from device");

 		}

+

+		/* don't retry GET_STATUS requests */

+		if(type == (Rd2h|Rclass|Rother)

+		&& req == Rgetstatus

+		&& value == 0)

+			break;

+

 		nerr++;

 		if(*err == 0)

 			rerrstr(err, sizeof(err));

-- 

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