Avoid compiler casting warnings Part 2

This saves instructions that are related to casting as well as compiler warnings.

plugins/sudoers/tsdump.c

@@ -81,7 +81,7 @@ main(int argc, char *argv[])
 
     /* Initialize the debug subsystem. */
     if (sudo_conf_read(NULL, SUDO_CONF_DEBUG) == -1)
-	exit(EXIT_FAILURE);
+	return EXIT_FAILURE;
     sudoers_debug_register(getprogname(), sudo_conf_debug_files(getprogname()));
 
     while ((ch = getopt(argc, argv, "f:u:")) != -1) {