[network-manager-openconnect] auth-dialog: mark write_progress() with format attribute

[Thomas Haller <thaller src gnome org>]

commit 89a4fc5b0da9d83db450cf3be995c6fe81757d75
Author: Thomas Haller <thaller redhat com>
Date:   Mon Sep 19 10:47:59 2016 +0200

    auth-dialog: mark write_progress() with format attribute
    
    Required to call g_strdup_vprintf() on fmt without format
    warning from the compiler.

 auth-dialog/main.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/auth-dialog/main.c b/auth-dialog/main.c
index 277e805..a6ebe34 100644
--- a/auth-dialog/main.c
+++ b/auth-dialog/main.c
@@ -1160,6 +1160,7 @@ static gboolean write_notice_real(char *message)
 }
 
 /* runs in worker thread */
+ _nm_printf (3, 4)
 static void write_progress(void *cbdata, int level, const char *fmt, ...)
 {
        va_list args;