[PATCH][next] net: airoha: Avoid -Wflex-array-member-not-at-end warning

["Gustavo A. R. Silva" <gustavoars@kernel.org>]

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Move the conflicting declaration to the end of the corresponding
structure. Notice that `struct airoha_foe_entry` is a flexible
structure, this is a structure that contains a flexible-array
member.

Fix the following warning:

drivers/net/ethernet/airoha/airoha_eth.h:474:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/net/ethernet/airoha/airoha_eth.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/airoha/airoha_eth.h b/drivers/net/ethernet/airoha/airoha_eth.h
index 77fd13d466dc..cd13c1c1224f 100644
--- a/drivers/net/ethernet/airoha/airoha_eth.h
+++ b/drivers/net/ethernet/airoha/airoha_eth.h
@@ -471,7 +471,6 @@ struct airoha_flow_table_entry {
 		};
 	};
 
-	struct airoha_foe_entry data;
 	struct hlist_node l2_subflow_node; /* PPE L2 subflow entry */
 	u32 hash;
 
@@ -480,6 +479,9 @@ struct airoha_flow_table_entry {
 
 	struct rhash_head node;
 	unsigned long cookie;
+
+	/* Must be last --ends in a flexible-array member. */
+	struct airoha_foe_entry data;
 };
 
 struct airoha_wdma_info {
-- 
2.43.0