test: Add udevice declaration to avoid build error
When including this file on a board other than sandbox (e.g by enabling
UNIT_TEST and CMD_SETEXPR) an results. Fix it by declaring struct udevice
first.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/dm/test.h b/include/dm/test.h
index 6ac6672..c5a9610 100644
--- a/include/dm/test.h
+++ b/include/dm/test.h
@@ -6,6 +6,8 @@
#ifndef __DM_TEST_H
#define __DM_TEST_H
+struct udevice;
+
/**
* struct dm_test_cdata - configuration data for test instance
*