Update XZ Utils to 5.0.4 (third_party)

src/common/tuklib_open_stdxxx.c

 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       tuklib_open_stdxxx.c
 /// \brief      Make sure that file descriptors 0, 1, and 2 are open
 //
 //  Author:     Lasse Collin
 //
 //  This file has been put into the public domain.
 //  You can do whatever you want with this file.
 //
@@ skipping 21 matching lines @@
                 // We use fcntl() to check if the file descriptor is open.
                 if (fcntl(i, F_GETFD) == -1 && errno == EBADF) {
                         // With stdin, we could use /dev/full so that
                         // writing to stdin would fail. However, /dev/full
                         // is Linux specific, and if the program tries to
                         // write to stdin, there's already a problem anyway.
                         const int fd = open("/dev/null", O_NOCTTY
                                         | (i == 0 ? O_WRONLY : O_RDONLY));
 
                         if (fd != i) {
+                                if (fd != -1)
+                                        (void)close(fd);
+
                                 // Something went wrong. Exit with the
                                 // exit status we were given. Don't try
                                 // to print an error message, since stderr
                                 // may very well be non-existent. This
                                 // error should be extremely rare.
-                                (void)close(fd);
                                 exit(err_status);
                         }
                 }
         }
 #endif
 
         return;
 }