RDMA/hns: Drop local zgid in favor of core defined variable

The zgid is already provided by IB/core, so there is no need in locally
defined variable, let's drop it and reuse common one.
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/hns/hns_roce_main.c

@@ -99,7 +99,6 @@ static int hns_roce_del_gid(const struct ib_gid_attr *attr, void **context)
 {
 	struct hns_roce_dev *hr_dev = to_hr_dev(attr->device);
 	struct ib_gid_attr zattr = { };
-	union ib_gid zgid = { {0} };
 	u8 port = attr->port_num - 1;
 	unsigned long flags;
 	int ret;