libptouch の更新に追従

src/lib/libptouch_usb.c

@@ -111,6 +111,7 @@ libptouch_err_t libptouch_open_usb_vid_pid(libptouch_ctx *ctx, uint16_t vid,
 	(void)libusb_clear_halt(h, ctx->bulk_out_ep);
 	(void)libusb_clear_halt(h, ctx->bulk_in_ep);
 
+	ctx->usb_pid = pid;
 	ctx->usb_open = 1;
 	ptouch_set_error(ctx, LIBPTOUCH_OK, "");
 	return LIBPTOUCH_OK;
@@ -141,6 +142,7 @@ void libptouch_close(libptouch_ctx *ctx)
 	}
 	ctx->bulk_out_ep = 0;
 	ctx->bulk_in_ep = 0;
+	ctx->usb_pid = 0;
 	ctx->usb_open = 0;
 }