Fix handling of list of .changes files to upload.

dak/security_install.py

@@ -114,7 +114,7 @@ def do_upload(changes_files):
             uploads[upload_uri] = []
         uploads[upload_uri].extend(file_list)
         # Update the changes list for the upload uri
-        if not changes.has_key(upload_uri):
+        if not changesfiles.has_key(upload_uri):
             changesfiles[upload_uri] = []
         changesfiles[upload_uri].append(changes_file)
         # Remember the suites and source name/version