patch 8.2.2292: Vim: expr test fails

Problem:    Vim: expr test fails.
Solution:   Add missing part of "null" support.
diff --git a/src/version.c b/src/version.c
index 4a42d49..6b96628 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2292,
+/**/
     2291,
 /**/
     2290,