closedir(3) handling NULL

[Bryan Drewery]

Hi,

Please review. I would like to commit this.

I found that Linux handles closedir(NULL) fine and returns EINVAL. POSIX
[1] specifies that EBADF should be returned if "The dirp argument does
not refer to an open directory stream"

[1] http://pubs.opengroup.org/onlinepubs/009696799/functions/closedir.html

I've updated fdclosedir(3) as well to behave the same.

I'll also update the manpage if there is no objection.

Thanks,
Bryan Drewery
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