Fix Windows build.

signed/unsigned comparison. Just add a cast for now as in s3_both.c. Later
we'll properly size_t it alongside other tightening of this interface.

Change-Id: Idc8441d65e8ca65e39ab7172a8ec87d9ad710ed6
Reviewed-on: https://boringssl-review.googlesource.com/3860
Reviewed-by: Adam Langley <agl@google.com>
1 file changed