cxgb4 : Fix missing initialization of win0_lock

win0_lock was being used un-initialized, resulting in warning traces
being seen when lock debugging is enabled (and just wrong)

Fixes : fc5ab020 ('cxgb4: Replaced the backdoor mechanism to access the HW
 memory with PCIe Window method')
Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: Casey Leedom <leedom@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -6614,6 +6614,7 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	spin_lock_init(&adapter->stats_lock);
 	spin_lock_init(&adapter->tid_release_lock);
+	spin_lock_init(&adapter->win0_lock);
 
 	INIT_WORK(&adapter->tid_release_task, process_tid_release_list);
 	INIT_WORK(&adapter->db_full_task, process_db_full);