work on adding testsuite runs to randomconfig test builds

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

archival/cpio.c

@@ -311,6 +311,7 @@ int cpio_main(int argc UNUSED_PARAM, char **argv)
 	/* no parameters */
 	opt_complementary = "=0";
 	opt = getopt32(argv, OPTION_STR, &cpio_filename);
+	argv += optind;
 	if (opt & CPIO_OPT_FILE) { /* -F */
 		xmove_fd(xopen(cpio_filename, O_RDONLY), STDIN_FILENO);
 	}