patch 8.2.4473: Coverity warnds for not checking return value of ftell()

Problem:    Coverity warnds for not checking return value of ftell().
Solution:   Bail out if ftell() returns a negative value.

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4473,
 /**/
     4472,
 /**/