patch 8.2.5089: some functions return a different value on failure

Problem:    Some functions return a different value on failure.
Solution:   Initialize the return value earlier. (Yegappan Lakshmanan,
            closes #10568)

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    5089,
 /**/
     5088,
 /**/