[issue17899] os.listdir() leaks FDs if invoked on FD pointing to a non-directory

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Larry, you forgot to remove "#undef HAVE_FDOPENDIR" at the start of the file. Beside this line the patch LGTM. I withdraw my objections in msg190887 because `close(fd)` can fail and change errno.

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