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examples/parse_args.h: avoid unreachable code, add comment

--- a/examples/parse_args.h

+++ b/examples/parse_args.h

@@ -200,11 +200,11 @@

     {NULL,                    0, NULL, 0}

   };

 #endif /* HAVE_GETOPT_H */

-  prog_name = argv[0];

+  // better safe than sorry

   if (argc < 1) {

     usage (stderr, 1);

-    return -1;

   }

+  prog_name = argv[0];

 #ifdef HAVE_GETOPT_H

   do {

     next_option = getopt_long (argc, argv, options, long_options, NULL);