crypto: return CHECK_OK in VerifyCallback

VerifyCallback returns 1 in two locations but CHECK_CERT_REVOKED in a
third return statment. This commit suggests that CHECK_OK is used
instead of 1. CHECK_OK is also used as the return value in
CheckWhitelistedServerCert so it seems to be consitent change to make.

PR-URL: https://github.com/nodejs/node/pull/13241


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>