vfio/mdev: Add missing error handling to dev_set_name()

stable inclusion
category: feature
from stable-5.13-rc1
commit 18d73124
bugzilla: https://gitee.com/openeuler/kernel/issues/I4NR4D

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=18d731242d5c67c0783126c42d3f85870cec2df5



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This can fail, and seems to be a popular target for syzkaller error
injection. Check the error return and unwind with put_device().

Fixes: 7b96953b ("vfio: Mediated device Core driver")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Message-Id: <9-v2-d36939638fc6+d54-vfio2_jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Reviewed-by: Xu Xiaoyang <xuxiaoyang2@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Reviewed-by: Xu Xiaoyang <xuxiaoyang2@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>