This patch fixes RDP length in case when driver needs to reduce length of
RDP response

Link: https://lore.kernel.org/r/20200212214436.25532-16-hmadhani@marvell.comSigned-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>