IB/usnic: Fix out of bounds index check in query pkey

The pkey table size is one element, index should be tested for > 0 instead
of > 1.

Fixes: e3cf00d0 ("IB/usnic: Add Cisco VIC low-level hardware driver")
Signed-off-by: Gal Pressman <galpress@amazon.com>
Acked-by: Parvi Kaustubhi <pkaustub@cisco.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/usnic/usnic_ib_verbs.c

@@ -449,7 +449,7 @@ struct net_device *usnic_get_netdev(struct ib_device *device, u8 port_num)
 int usnic_ib_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
 				u16 *pkey)
 {
-	if (index > 1)
+	if (index > 0)
 		return -EINVAL;
 
 	*pkey = 0xffff;