The VF spinlock was never initialized. It works because it is
in zmalloc'd memory and an unlocked lock on x86 is 0.
But for good practice, all spinlock's should be initialized.
Fixes: dc7680e859 ("net/netvsc: support integrated VF")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>