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nusb: only read 18 bytes for device descriptor

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

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

@@ -231,7 +231,7 @@

 int

 loaddevdesc(Dev *d)

 {

-	uchar buf[Ddevlen+255];

+	uchar buf[Ddevlen];

 	int nr;

 	int type;

 	Ep *ep0;

@@ -238,7 +238,7 @@

 	type = Rd2h|Rstd|Rdev;

 	nr = sizeof(buf);

-	memset(buf, 0, Ddevlen);

+	memset(buf, 0, nr);

 	if((nr=usbcmd(d, type, Rgetdesc, Ddev<<8|0, 0, buf, nr)) < 0)

 		return -1;

 	/*