patch 9.1.0515: Vim9: segfault in object_equal()

Problem:  Vim9: segfault in object_equal()
Solution: test for object pointer being NULL, before dereferencing them
          (Ernie Rael)

closes: #15085

Signed-off-by: Ernie Rael <errael@raelity.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 391ac73..357f9c1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    515,
+/**/
     514,
 /**/
     513,