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usbd: use dprint() report to standard-error instad of standard-out

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

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

@@ -234,8 +234,8 @@

 	 * (a get configuration descriptor also fails for them!)

 	 */

 	if(nr < Ddevlen){

-		print("%s: %s: warning: device with short descriptor\n",

-			argv0, d->dir);

+		dprint(2, "%s: %s: warning: device with short descriptor (got %d bytes)\n",

+			argv0, d->dir, nr);

 		if(nr < Ddevlen-1){

 			werrstr("short device descriptor (%d bytes)", nr);

 			return -1;