patch 8.1.2116: no check for out of memory

Problem:    No check for out of memory.
Solution:   Check for NULL pointer.
diff --git a/src/version.c b/src/version.c
index b1bccb4..11bfd68 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2116,
+/**/
     2115,
 /**/
     2114,