patch 9.1.1470: use-after-free with popup callback on error

Problem:  use-after-free with popup callback on error
          (Brian Carbone, lifepillar)
Solution: check if the popup window is valid before accessing it

fixes: #17558
closes: #17565

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 8b4f3e7..05e85ad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1470,
+/**/
     1469,
 /**/
     1468,