patch 9.0.0628: Coverity warns for not checking return value

Problem:    Coverity warns for not checking return value.
Solution:   Check the return value and simplify the code.

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    628,
 /**/
     627,
 /**/