patch 8.1.2116: no check for out of memory

Problem:    No check for out of memory.
Solution:   Check for NULL pointer.

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2116,
 /**/
     2115,
 /**/