sfc: Replace spin_is_locked() with lockdep

lockdep_assert_held() is better suited to checking locking requirements,
since it only checks if the current thread holds the lock regardless of
whether someone else does. This is also a step towards possibly removing
spin_is_locked().
Signed-off-by: NLance Roy <ldr709@gmail.com>
Cc: Solarflare linux maintainers <linux-net-drivers@solarflare.com>
Cc: Bert Kenward <bkenward@solarflare.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: <netdev@vger.kernel.org>
Signed-off-by: NPaul E. McKenney <paulmck@linux.ibm.com>
Acked-by: NEdward Cree <ecree@solarflare.com>

drivers/net/ethernet/sfc/efx.c

@@ -3167,7 +3167,7 @@ struct hlist_head *efx_rps_hash_bucket(struct efx_nic *efx,
 {
 	u32 hash = efx_filter_spec_hash(spec);
 
-	WARN_ON(!spin_is_locked(&efx->rps_hash_lock));
+	lockdep_assert_held(&efx->rps_hash_lock);
 	if (!efx->rps_hash_table)
 		return NULL;
 	return &efx->rps_hash_table[hash % EFX_ARFS_HASH_TABLE_SIZE];