net: add gnu::format attribute for log_client

diff --git a/src/net.hpp b/src/net.hpp
index 99bf166..ba00221 100644 (file)
--- a/src/net.hpp
+++ b/src/net.hpp
@@ -7,7 +7,7 @@
 void sendbuf(Client *client);
 void sendbuf_visible(Client *client);
 void update_poll_reg(Client *cl);
-void log_client(Client *cl, const char *format, ...);
+[[gnu::format(__printf__, 2, 3)]] void log_client(Client *cl, const char *format, ...);
 void killConnection(Client *client, int byChoice);
 void killConnectionPart2(Client *cl);
 void read_proc(Client *cl);