dtoc: Fix up a code comment that confuses pylint

This produces a pylint error at present. Fix it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/dtoc/dtb_platdata.py b/tools/dtoc/dtb_platdata.py
index 3bb5c68..a69a788 100644
--- a/tools/dtoc/dtb_platdata.py
+++ b/tools/dtoc/dtb_platdata.py
@@ -72,7 +72,7 @@
 
 
 # This holds information about each type of output file dtoc can create
-# type: Type of file (Ftype)
+# ftype: Type of file (Ftype)
 # fname: Filename excluding directory, e.g. 'dt-plat.c'
 # hdr_comment: Comment explaining the purpose of the file
 OutputFile = collections.namedtuple('OutputFile',