dom0/core: fix zenity fallback in qrexec_daemon

qrexec/qrexec_daemon.c

@@ -99,8 +99,9 @@ int ask_on_connect_timeout(int xid, int timeout)
 #define KDIALOG_CMD "kdialog --title 'Qrexec daemon' --warningyesno "
 #define ZENITY_CMD "zenity --title 'Qrexec daemon' --question --text "
 	snprintf(text, sizeof(text),
-			ret==0 ? KDIALOG_CMD : ZENITY_CMD
+			"%s"
 			"'Timeout while trying connecting to qrexec agent (Xen domain ID: %d). Do you want to wait next %d seconds?'",
+			ret==0 ? KDIALOG_CMD : ZENITY_CMD,
 			xid, timeout);
 #undef KDIALOG_CMD
 #undef ZENITY_CMD