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nusb/cam: fix mistake (nil vs -1)

--- a/sys/src/cmd/nusb/cam/video.c

+++ b/sys/src/cmd/nusb/cam/video.c

@@ -278,7 +278,7 @@

 	if(usbcmd(d, 0x21, SET_CUR, VS_COMMIT_CONTROL << 8, c->iface->id, (uchar *) &c->pc, sizeof(ProbeControl)) < sizeof(ProbeControl)) goto err;

 	e = selbw(c, &c->pc, d->usb->ep[c->hdr->bEndpointAddress & Epmax]);

 	if(e == nil || setalt(c->dev, e->iface) < 0)

-		return nil;

+		return -1;

 	c->ep = openep(d, e);

 	if(c->ep == nil){

 		setalt(d, c->iface);