BUG/MINOR: ssl: Correctly add the 1 for the sentinel to the number of elements

In `crtlist_dup_filters()` add the `1` to the number of elements instead of
the size of a single element.

This bug was introduced in commit 2954c478ebab019b814b97cbaec4653af7f03f34,
which is 2.2+. No backport needed.
1 file changed