Jilles Tjoelker 39e499a8d2 posix_spawn_file_actions_addopen(3): Correct error for bad file descriptor.
As per POSIX.1-2008, posix_spawn_file_actions_add* return [EBADF] if a file
descriptor is negative, not [EINVAL]. The bug was only in the manual page;
the code is correct.

MFC after:	1 week
2013-05-09 16:42:01 +00:00
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