[PATCH 12/15] selftests/tcp_ao: fix -Wdiscarded-qualifiers under C23

[Eva Kurchatova <eva.kurchatova@virtuozzo.com>]

glibc ≥ 2.42 (GCC 15) defaults to -std=gnu23, which promotes
-Wdiscarded-qualifiers to an error.

In C23, strstr() and strchr() return "const char *".

Change variable types to const char * where the pointers are never
modified (column)

Signed-off-by: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
---
 tools/testing/selftests/net/tcp_ao/lib/proc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/tcp_ao/lib/proc.c b/tools/testing/selftests/net/tcp_ao/lib/proc.c
index 8b984fa04286..50062b527a39 100644
--- a/tools/testing/selftests/net/tcp_ao/lib/proc.c
+++ b/tools/testing/selftests/net/tcp_ao/lib/proc.c
@@ -56,7 +56,7 @@ static struct netstat *lookup_get(struct netstat *ns,
 
 static struct netstat *lookup_get_column(struct netstat *ns, const char *line)
 {
-	char *column;
+	const char *column;
 
 	column = strchr(line, ':');
 	if (!column)
-- 
2.54.0