patch 8.2.2292: Vim: expr test fails

Problem:    Vim: expr test fails.
Solution:   Add missing part of "null" support.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2292,
 /**/
     2291,
 /**/