BUG/MINOR: ssl: fix deinit of the ca-file tree

Commit b0c4827 ("BUG/MINOR: ssl: free the cafile entries on deinit")
introduced a double free.

The node was never removed from the tree before its free.

Fix issue #1836.

Must be backported where b0c4827 was backported. (2.6 for now).
1 file changed