cryptocheck: Don't treat OpenSSL errors as fatal

Abort the current test but keep running additional tests if OpenSSL
reports an error during a test. This matches the behavior for other
tests such as an error from OCF.

Reviewed by: markj
Sponsored by: AFRL, DARPA
Differential Revision: https://reviews.freebsd.org/D45279

(cherry picked from commit b0e7358bf8b9791aaaf38807c841953946b88785)