octeontx2-pf: Fix missing spin_lock_init() in otx2_tc_add_flow()

The driver allocates the spinlock but not initialize it.
Use spin_lock_init() on it to initialize it correctly.

Fixes: d8ce30e0 ("octeontx2-pf: add tc flower stats handler for hw offloads")
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeontx2/nic/otx2_tc.c

@@ -536,6 +536,7 @@ static int otx2_tc_add_flow(struct otx2_nic *nic,
 	new_node = kzalloc(sizeof(*new_node), GFP_KERNEL);
 	if (!new_node)
 		return -ENOMEM;
+	spin_lock_init(&new_node->lock);
 	new_node->cookie = tc_flow_cmd->cookie;
 
 	mutex_lock(&nic->mbox.lock);