[PATCH 2/2] net/mlx5: fix build with Gcc 15

[Stephen Hemminger <stephen@networkplumber.org>]

Fixes warnings from Gcc 15 about using string for initialization.
../drivers/net/mlx5/mlx5_flow.c: In function ‘mlx5_legacy_dmac_flow_create’:
../drivers/net/mlx5/mlx5_flow.c:8568:44: warning: initializer-string for array of ‘unsigned char’ is too long [-Wunterminated-string-initialization]
 8568 |                 .hdr.dst_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
      |                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/net/mlx5/mlx5_flow.c: In function ‘mlx5_legacy_dmac_vlan_flow_create’:
../drivers/net/mlx5/mlx5_flow.c:8583:44: warning: initializer-string for array of ‘unsigned char’ is too long [-Wunterminated-string-initialization]
 8583 |                 .hdr.dst_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
      |                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~

Fixes: cf99567fe566 ("net/mlx5: add legacy unicast flow rules management")
Cc: dsosnowski@nvidia.com

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 drivers/net/mlx5/mlx5_flow.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 9c43201e05..f8cfa661ec 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -8565,7 +8565,7 @@ mlx5_legacy_dmac_flow_create(struct rte_eth_dev *dev, const struct rte_ether_add
 		.hdr.dst_addr = *addr,
 	};
 	struct rte_flow_item_eth unicast_mask = {
-		.hdr.dst_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
+		.hdr.dst_addr.addr_bytes = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
 	};
 
 	return mlx5_ctrl_flow(dev, &unicast, &unicast_mask);
@@ -8580,7 +8580,7 @@ mlx5_legacy_dmac_vlan_flow_create(struct rte_eth_dev *dev,
 		.hdr.dst_addr = *addr,
 	};
 	struct rte_flow_item_eth unicast_mask = {
-		.hdr.dst_addr.addr_bytes = "\xff\xff\xff\xff\xff\xff",
+		.hdr.dst_addr.addr_bytes = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
 	};
 	struct rte_flow_item_vlan vlan_spec = {
 		.hdr.vlan_tci = rte_cpu_to_be_16(vid),
-- 
2.45.2