The glibc read() and write() functions are defined with the
__warn_unused_result__ attribute when using FORTIFY_SOURCE. Don't ignore
their return value.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>