Make sure OPENSSL_cleanse checks for NULL
In master we have the function OPENSSL_clear_free(x,y), which immediately returns if x == NULL. In <=1.0.2 this function does not exist so we have to do: OPENSSL_cleanse(x, y); OPENSSL_free(x); However, previously, OPENSSL_cleanse did not check that if x == NULL, so the real equivalent check would have to be: if (x != NULL) OPENSSL_cleanse(x, y); OPENSSL_free(x); It would be easy to get this wrong during cherry-picking to other branches and therefore, for safety, it is best to just ensure OPENSSL_cleanse also checks for NULL. Reviewed-by:Rich Salz <rsalz@openssl.org> (cherry picked from commit 020d8fc8)
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