patch 8.2.4073: Coverity warns for using NULL pointer

Problem:    Coverity warns for using NULL pointer.
Solution:   Bail out when running out of memory. Check for running over end of
            a string.
diff --git a/src/version.c b/src/version.c
index 1209772..1b37a5d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4073,
+/**/
     4072,
 /**/
     4071,