dm: core: Drop unused parameter from dm_scan_fdt()

This doesn't need to be passed the devicetree anymore. Drop it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/dm/test-main.c b/test/dm/test-main.c
index fd24635..2ab73b6 100644
--- a/test/dm/test-main.c
+++ b/test/dm/test-main.c
@@ -213,7 +213,7 @@
 	ut_assertok(dm_init(CONFIG_IS_ENABLED(OF_LIVE)));
 	dm_scan_platdata(false);
 	if (!CONFIG_IS_ENABLED(OF_PLATDATA))
-		dm_scan_fdt(gd->fdt_blob, false);
+		dm_scan_fdt(false);
 
 	return uts->fail_count ? CMD_RET_FAILURE : 0;
 }