copy_and_spawn_sgid: Avoid double calls to close()
If close() on infd and outfd succeeded, reset the fd numbers so that
we don't attempt to close them again.
Reviewed-by: 
Arjun Shankar <arjun@redhat.com>
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If close() on infd and outfd succeeded, reset the fd numbers so that
we don't attempt to close them again.
Reviewed-by: Arjun Shankar <arjun@redhat.com>