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Subject[BUG] vDPA/ifcvf: got a warning when removing the module
Hello,

I found a bug in the ifcvf driver.
When removing the module, I got the following warning:

[ 14.478123] general protection fault, probably for non-canonical
address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI
[ 14.478701] KASAN: null-ptr-deref in range
[0x0000000000000028-0x000000000000002f]
[ 14.479922] RIP: 0010:vdpa_mgmtdev_unregister+0x39/0x150
[ 14.484063] Call Trace:
[ 14.484186] <TASK>
[ 14.484292] ? _raw_spin_unlock_irqrestore+0x3d/0x60
[ 14.484536] ifcvf_remove+0x3a/0x50 [ifcvf]
[ 14.484743] pci_device_remove+0x92/0x240

The reason is that the 'ifcvf_mgmt_dev' is zero which means that
ifcvf_vdpa_dev_add() was not executed.
Since I am not familiar with the driver, I cannot find a proper solution for it.

Zheyu Ma

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