attrs: Check printf formatting in buffer_append_printf()

https://bugzilla.redhat.com/show_bug.cgi?id=985497

diff --git a/common/attrs.c b/common/attrs.c
index 8054e381c101348654011c14d18232eadd6edc26..b06a342fc959d44ec5ca0c461aa199aa0701b309 100644 (file)
--- a/common/attrs.c
+++ b/common/attrs.c
@@ -513,6 +513,11 @@ p11_attr_hash (const void *data)
        return hash;
 }
 
+static void
+buffer_append_printf (p11_buffer *buffer,
+                      const char *format,
+                      ...) GNUC_PRINTF(2, 3);
+
 static void
 buffer_append_printf (p11_buffer *buffer,
                       const char *format,