Exit return code 0 when passing -h cmd line option

autoupdate.pl

@@ -768,7 +768,7 @@ sub usage {
 	    . " \t\t\tIf the filename is '-' the input will be\n"
 	    . " \t\t\tread from stdin\n"
 	    . " -h|--help\t\tShow this help\n";
-	exit (1);
+	exit ($show_help ? 0 : 1);
 }
 
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