patch 9.0.2117: [security] use-after-free in qf_free_items

Problem:  [security] use-after-free in qf_free_items
Solution: only access qfpnext, if it hasn't been freed

Coverity discovered a possible use-after-free in qf_free_items. When
freeing the qfline items, we may access freed memory, when qfp ==
qfpnext.

So only access qfpnext, when it hasn't been freed.

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index ed11338..6994b34 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2117,
+/**/
     2116,
 /**/
     2115,