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md() already checks for md_info == NULL. Also, in the future it might also return other errors (eg hardware errors if acceleration is used), so it make more sense to check its return value than to check for NULL ourselves and then assume no other error can occur. Also, currently, md_info == NULL can never happen except if the MD and OID modules get out of sync, or if the user messes with members of the x509_crt structure directly. This commit does not change the current behaviour, which is to treat MD errors the same way as a bad signature or no trusted root.