Close all FD's instead of just 0,1,2 on startup

Changed the startup in the main function to loop through all file
descriptors from getrlimit(RLIMIT_NOFILE) down to 0, and close them all
to make sure none are left opened by the parent process.

timeoutd.c

@@ -351,9 +351,10 @@ char *argv[];
     if (pid > 0)
         exit(0);
 
-    close(0);
-    close(1);
-    close(2);
+    for (int i = getrlimit(RLIMIT_NOFILE); i >= 0; --i) {
+        close(i);
+    }
+
     if (setsid() < 0) {
         openlog("timeoutd", OPENLOG_FLAGS, LOG_DAEMON);
         syslog(LOG_ERR, "Failed to set new session ID at startup.");