pre-upload: remove unused input for clang-format

It looks like the line is copied from _run_checkpatch() below, but
clang-format.py does not expect any content from stdin.

BUG=None
TEST=Add a bad-formatted line and check pre-upload.py can still catch
     it.

Change-Id: I8e1c3107ae81fdd8de50d54d9707ab43590f9f53
Reviewed-on: https://chromium-review.googlesource.com/1517252
Commit-Ready: Shik Chen <shik@chromium.org>
Tested-by: Shik Chen <shik@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed