bn/bn_lib.c: remove bn_check_top from bn_expand2.
Trouble is that addition is postponing expansion till carry is calculated, and if addition carries, top word can be zero, which triggers assertion in bn_check_top. Reviewed-by:Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6810) (cherry picked from commit e42395e6) Resolved conflicts: crypto/bn/bn_lib.c
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