C4701 is "potentially uninitialized local variable 'buf' used". It sometimes results in false positives, which can now be suppressed using the macro OPENSSL_SUPPRESS_POTENTIALLY_UNINITIALIZED_WARNINGS. Change-Id: I15068b5a48e1c704702e7752982b9ead855e7633 Reviewed-on: https://boringssl-review.googlesource.com/3160 Reviewed-by: Adam Langley <agl@google.com>