dmaengine: idxd: Fix missing error code in idxd_cdev_open()

mainline inclusion
from mainline-v5.13
commit 99b18e88
category: bugfix
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I596WO


CVE: NA

Intel-SIG: commit 99b18e88 dmaengine: idxd: Fix missing error code in idxd_cdev_open().
Incremental backporting patches for DSA/IAA on Intel Xeon platform.

--------------------------------

The error code is missing in this code scenario, add the error code
'-EINVAL' to the return value 'rc'.

Eliminate the follow smatch warning:

drivers/dma/idxd/cdev.c:113 idxd_cdev_open() warn: missing error code
'rc'.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Acked-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/1622628446-87909-1-git-send-email-jiapeng.chong@linux.alibaba.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>