pack_firmware: Rename 'replace_dict' variable

This is not very descriptive and is the same as a variable further down.
To avoid confusion, rename it.

BUG=chromium:741043
BUG=b:64117873
TEST=PYTHONPATH=~/cosarm python pack_firmware_unittest.py && \
PYTHONPATH=~/cosarm python pack_firmware_functest.py

Change-Id: I4803a227bfe706e33fbf67090a243daac5f697fd
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/613681
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Jason Clinton <jclinton@chromium.org>
diff --git a/pack_firmware.py b/pack_firmware.py
index 0824f70..312df66 100755
--- a/pack_firmware.py
+++ b/pack_firmware.py
@@ -1098,15 +1098,15 @@
               tool_base=tool_base,
               extras=extras,
               model=model)
-          replace_dict = self._GetReplaceDict(
+          setvars_dict = self._GetReplaceDict(
               image_files,
               self._GetString(image_node, 'stable-main-version'),
               self._GetString(image_node, 'stable-ec-version'),
               self._GetString(image_node, 'stable-pd-version'))
-          replace_dict['REPLACE_MODEL'] = model
+          setvars_dict['REPLACE_MODEL'] = model
           fname = os.path.join(self._basedir, MODELS_DIR, model, 'setvars.sh')
           self._CreateFileFromTemplate(self._setvars_template_file, fname,
-                                       replace_dict, True)
+                                       setvars_dict, True)
       else:
         script = args.script
         image_files = self._ProcessModel(