update_engine: Run clang-format on payload_consumer

We just did a AOSP merge, so it is a good time to clean things up.

BUG=none
TEST=unittest

Change-Id: I4fe9cef5eb8709344d6b78bc298c0f1c03308ffc
Reviewed-on: https://chromium-review.googlesource.com/1407540
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Sen Jiang <senj@chromium.org>
Reviewed-by: Xiaochu Liu <xiaochu@chromium.org>
diff --git a/payload_consumer/bzip_extent_writer.h b/payload_consumer/bzip_extent_writer.h
index 023db75..ec181a7 100644
--- a/payload_consumer/bzip_extent_writer.h
+++ b/payload_consumer/bzip_extent_writer.h
@@ -47,7 +47,7 @@
 
  private:
   std::unique_ptr<ExtentWriter> next_;  // The underlying ExtentWriter.
-  bz_stream stream_;  // the libbz2 stream
+  bz_stream stream_;                    // the libbz2 stream
   brillo::Blob input_buffer_;
 };