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examples/utils.c: make -i optional

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -174,6 +174,18 @@

   }

   while (next_option != -1);

+  if ( source_uri == NULL ) {

+    if (argc - optind == 1) {

+      source_uri = argv[optind];

+    } else if ( argc - optind > 1 ) {

+      errmsg ("Error: too many non-option arguments `%s'\n", argv[argc - 1]);

+      usage ( stderr, 1 );

+    }

+  } else if ( argc - optind > 0 ) {

+    errmsg ("Error: extra non-option argument %s\n", argv[optind]);

+    usage ( stderr, 1 );

+  }

+

   if (source_uri != NULL) {

     debug ("Input file : %s\n", source_uri);

   } else if (source_uri != NULL && sink_uri != NULL) {