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.

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1825,
 /**/
     1824,
 /**/