ConfHandler: Remove lingering close
    
    The f.close() statement should have been removed in
    459ad524756a3f9b50feeedf31e33502dceae8d5.
    
    Signed-off-by: Ola x Nilsson <ola.x.nilsson@axis.com>
    Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
    Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
    Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>