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.
diff --git a/src/version.c b/src/version.c
index a2e66b2..73093f4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    628,
+/**/
     627,
 /**/
     626,