A negative error code should be returned.

Link: https://lore.kernel.org/r/20200829075746.19166-1-tian.xianting@h3c.comAcked-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Xianting Tian <tian.xianting@h3c.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>