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usb lib: add maxpkt and ntds to Altc struct

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

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

@@ -145,6 +145,8 @@

 	ep->maxpkt = GET2(dep->wMaxPacketSize);

 	ep->ntds = 1 + ((ep->maxpkt >> 11) & 3);

 	ep->maxpkt &= 0x7FF;

+	altc->maxpkt = ep->maxpkt;

+	altc->ntds = ep->ntds;

 	ep->addr = addr;

 	ep->type = type;

 	ep->isotype = (dep->bmAttributes>>2) & 0x03;

--- a/sys/src/cmd/nusb/lib/usb.h

+++ b/sys/src/cmd/nusb/lib/usb.h

@@ -221,6 +221,8 @@

 {

 	int	attrib;

 	int	interval;

+	int	maxpkt;

+	int	ntds;

 	void*	aux;		/* for the driver program */

 };