RDMA/i40iw: Use DEFINE_SPINLOCK() for spinlock

spinlock can be initialized automatically with DEFINE_SPINLOCK() rather
than explicitly calling spin_lock_init().

Link: https://lore.kernel.org/r/20210409095147.2294269-1-yebin10@huawei.comReported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYe Bin <yebin10@huawei.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/i40iw/i40iw_main.c

@@ -78,7 +78,7 @@ static struct i40e_client i40iw_client;
 static char i40iw_client_name[I40E_CLIENT_STR_LENGTH] = "i40iw";
 
 static LIST_HEAD(i40iw_handlers);
-static spinlock_t i40iw_handler_lock;
+static DEFINE_SPINLOCK(i40iw_handler_lock);
 
 static enum i40iw_status_code i40iw_virtchnl_send(struct i40iw_sc_dev *dev,
 						  u32 vf_id, u8 *msg, u16 len);
@@ -2043,7 +2043,6 @@ static int __init i40iw_init_module(void)
 	i40iw_client.ops = &i40e_ops;
 	memcpy(i40iw_client.name, i40iw_client_name, I40E_CLIENT_STR_LENGTH);
 	i40iw_client.type = I40E_CLIENT_IWARP;
-	spin_lock_init(&i40iw_handler_lock);
 	ret = i40e_register_client(&i40iw_client);
 	i40iw_register_notifiers();