BUG/MINOR: ssl: OCSP_single_get0_status can return -1

Commit 872085ce "BUG/MINOR: ssl: ocsp response with 'revoked' status is correct"
introduce a regression. OCSP_single_get0_status can return -1 and haproxy must
generate an error in this case.
Thanks to Sander Hoentjen who have spotted the regression.

This patch should be backported in 1.7, 1.6 and 1.5 if the patch above is
backported.
1 file changed