dtoc: Fix some minor errors

Fix some comments and a printf string which is incorrect.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py
index c1d04d4..e7703c1 100644
--- a/tools/dtoc/fdt.py
+++ b/tools/dtoc/fdt.py
@@ -428,7 +428,7 @@
         return node
 
 def FdtScan(fname):
-    """Returns a new Fdt object from the implementation we are using"""
+    """Returns a new Fdt object"""
     dtb = Fdt(fname)
     dtb.Scan()
     return dtb