Fix cleanup around socketpair() failure to copy out FDs.

- Use the fs.File, rather than the vfs.FileDescription, in the VFS1 version.

- Check for a nil fs.File/vfs.FileDescription before calling DecRef, which is
  possible if a racing dup2() or dup3() replaces the file descriptor between
  when it is installed and when it is returned. (This is not possible in Linux
  because Linux separates allocation of a file descriptor from binding an
  allocated file descriptor to a struct file, and dup2/dup3 return EBUSY if
  asked to replace an allocated but unbound file descriptor.)

PiperOrigin-RevId: 306517101

0 files changed, 0 insertions, 0 deletions