IPCUnixSocket::create() creates two file descriptors. One of them is stored in IPCUnixSocket and the other is returned to a caller. This clarifies the ownership using UniqueFD. Signed-off-by: Hirokazu Honda <hiroh@chromium.org> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Hirokazu Honda <hiroh@chromium.org> Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>