[PATCH iproute2-next] ss: fix the compiler warning

[Denis Kirjanov <kirjanov@gmail.com>]

the patch fixes the following compiler warning:

ss.c:1064:53: warning: format string is not a string literal [-Wformat-nonliteral]
        len = vsnprintf(pos, buf_chunk_avail(buffer.tail), fmt, _args);
                                                           ^~~
1 warning generated.
    LINK     ss

Fixes: e3ecf0485 ("ss: pretty-print BPF socket-local storage")
Signed-off-by: Denis Kirjanov <dkirjanov@suse.de>
---
 misc/ss.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/misc/ss.c b/misc/ss.c
index 87008d7c..038905f3 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -1042,6 +1042,7 @@ static int buf_update(int len)
 }
 
 /* Append content to buffer as part of the current field */
+__attribute__((format(printf, 1, 0)))
 static void vout(const char *fmt, va_list args)
 {
 	struct column *f = current_field;
-- 
2.30.2