OpenSSL: Correct the return value of BIO_get_ktls_*().

OpenSSL: Correct the return value of BIO_get_ktls_*().

BIO_get_ktls_send() and BIO_get_ktls_recv() are documented as
returning either 0 or 1.  However, they were actually returning the
internal value of the associated BIO flag for the true case instead of
1.

Also trim redundant ternary operators.

Reviewed by:	jkim
Obtained from:	OpenSSL (f16e52b67c9261bdc7e1284a50502a802921ac6d)
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D31438

(cherry picked from commit 334d228a204c16d1384a978ab9b209e4e7e33275)