patch 8.0.1825: might use NULL pointer when out of memory

Problem:    Might use NULL pointer when out of memory. (Coverity)
Solution:   Handle NULL pointer better.
diff --git a/src/version.c b/src/version.c
index 12a8073..9743283 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1825,
+/**/
     1824,
 /**/
     1823,