Fix bio_test.c build on Windows.

MSVC does not allow pointer arithmetic on void* pointers. Also
fix some style issues around whether * hugs the type or the
variable name.

Change-Id: I40cc1627830b37879fd70e2b688a42df62b6c62a
Reviewed-on: https://boringssl-review.googlesource.com/2452
Reviewed-by: Adam Langley <agl@google.com>
1 file changed