bn: catch negative zero as an error
Change-Id: I5ab72ad0aae9069b47d5b7b7b9e25bd1b7afa251 Signed-off-by: Geoff Thorpe <geoff@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1672)
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0b50ac1a
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