[openwrt/openwrt] kernel: trelay: fix build warning on 6.12 kernel

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/8e90c5cfc292fe7e68c3fea3983a663e188f9fb6

commit 8e90c5cfc292fe7e68c3fea3983a663e188f9fb6
Author: Shiji Yang <yangshiji66 at outlook.com>
AuthorDate: Mon Apr 28 18:14:09 2025 +0800

    kernel: trelay: fix build warning on 6.12 kernel
    
    Make trelay_handle_frame() static to fix the build warning:
    
    /workspaces/openwrt/build_dir/target-x86_64_musl/linux-x86_64/trelay/trelay.c:38:21: error: no previous prototype for 'trelay_handle_frame' [-Werror=missing-prototypes]
       38 | rx_handler_result_t trelay_handle_frame(struct sk_buff **pskb)
          |                     ^~~~~~~~~~~~~~~~~~~
    
    Signed-off-by: Shiji Yang <yangshiji66 at outlook.com>
    Link: https://github.com/openwrt/openwrt/pull/18637
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 package/kernel/trelay/src/trelay.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/kernel/trelay/src/trelay.c b/package/kernel/trelay/src/trelay.c
index 1f14747597..8b3bef2a8e 100644
--- a/package/kernel/trelay/src/trelay.c
+++ b/package/kernel/trelay/src/trelay.c
@@ -35,7 +35,7 @@ struct trelay {
 	char name[];
 };
 
-rx_handler_result_t trelay_handle_frame(struct sk_buff **pskb)
+static rx_handler_result_t trelay_handle_frame(struct sk_buff **pskb)
 {
 	struct net_device *dev;
 	struct sk_buff *skb = *pskb;