This fixes a typo. Before this, the AT_FDCWD macro would be defined
regardless of whether or not it's been defined before.
Signed-off-by: NSamuel Hernandez <sam.hernandez.amador@gmail.com>
Signed-off-by: NWilly Tarreau <w@1wt.eu>
Signed-off-by: NPaul E. McKenney <paulmck@kernel.org>