lib: memzero_explicit: add comment for its usage
Lets improve the comment to add a note on when to use memzero_explicit() for those not digging through the git logs. We don't want people to pollute places with memzero_explicit() where it's not really necessary. Reference: https://lkml.org/lkml/2015/1/4/190Suggested-by: NHerbert Xu <herbert@gondor.apana.org.au> Signed-off-by: NDaniel Borkmann <dborkman@redhat.com> Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
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