Add a usb_read_nl_timeout macro.

usbutils.h

@@ -315,6 +315,9 @@ void *usb_resource_thread(void *userdata);
 #define usb_read_nl(cgpu, buf, bufsiz, read, cmd) \
 	_usb_read(cgpu, DEFAULT_EP_IN, buf, bufsiz, read, DEVTIMEOUT, "\n", cmd, false)
 
+#define usb_read_nl_timeout(cgpu, buf, bufsiz, read, timeotu, cmd) \
+	_usb_read(cgpu, DEFAULT_EP_IN, buf, bufsiz, read, timeout, "\n", cmd, false)
+
 #define usb_read_ok(cgpu, buf, bufsiz, read, cmd) \
 	_usb_read(cgpu, DEFAULT_EP_IN, buf, bufsiz, read, DEVTIMEOUT, "OK\n", cmd, false)