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nusb/lib: fix wrong endpoint id when openep() finds already existing endpoint file

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

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

@@ -54,8 +54,10 @@

 	if(access(name, AEXIST) == 0){

 		dprint(2, "%s: %s already exists; trying to open\n", argv0, name);

 		epd = opendev(name);

-		if(epd != nil)

+		if(epd != nil){

+			epd->id = id;

 			epd->maxpkt = ep->maxpkt;	/* guess */

+		}

 		return epd;

 	}

 	if(devctl(d, "new %d %d %s", id, ep->type, mode) < 0){