patch 7.4.1647
Problem:    Using freed memory after setqflist() and ":caddbuffer".  (Dominique)
Solution:   Set qf_ptr when adding the first item to the quickfix list.
diff --git a/src/version.c b/src/version.c
index 4ab8eed..95e2cba 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1647,
+/**/
     1646,
 /**/
     1645,