Yaowu Xu authored Jun 27, 2016 and James Zern committed Jun 30, 2016

The difference between src and dst will be signed, the error will be
unsigned. The change quiets -fsanitize=integer:
    unsigned integer overflow: 4294967295 * 4294967295

Change-Id: Ide662f26fae682309a3474243f8a5b5ccea2049e