patch 8.0.1512: warning for possibly using NULL pointer

Problem:    Warning for possibly using NULL pointer. (Coverity)
Solution:   Skip using the pointer if it's NULL.

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1512,
 /**/
     1511,
 /**/