netvsc: use ERR_PTR to avoid dereference issues
The rndis_filter_device_add function is called both in probe context and RTNL context,and creates the netvsc_device inner structure. It is easier to get the RTNL lock annotation correct if it returns the object directly, rather than implicitly by updating network device private data. Signed-off-by: NStephen Hemminger <sthemmin@microsoft.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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