binman: Drop the image name from the fake-blob message

This is not really needed and it makes the message different from the
missing-blob message. Update it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/control.py b/tools/binman/control.py
index f4c1fd0..e0d2b38 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -578,10 +578,9 @@
     image.CheckFakedBlobs(faked_list)
     if faked_list:
         tout.Warning(
-            "Image '%s:%s' has faked external blobs and is non-functional: %s" %
-            (image.name, image.image_name,
-             ' '.join([os.path.basename(e.GetDefaultFilename())
-                       for e in faked_list])))
+            "Image '%s' has faked external blobs and is non-functional: %s" %
+            (image.name, ' '.join([os.path.basename(e.GetDefaultFilename())
+                                   for e in faked_list])))
     return bool(missing_list) or bool(faked_list)