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.
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 3ff8172..ea513b2 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -4656,7 +4656,7 @@
 	char **dst;
 	int i;
 
-	dst = calloc(fcount, sizeof(*dst) + 1);
+	dst = calloc(fcount + 1, sizeof(*dst));
 	if (!dst)
 		return NULL;