scanner: use printf format attributes for desc_dump

diff --git a/src/scanner.c b/src/scanner.c
index d0e64c0..69fefb3 100644 (file)
--- a/src/scanner.c
+++ b/src/scanner.c
@@ -158,6 +158,9 @@ static const char *indent(int n)
 }
 
 static void
+desc_dump(char *desc, const char *fmt, ...) __attribute__((format(printf,2,3)));
+
+static void
 desc_dump(char *desc, const char *fmt, ...)
 {
        va_list ap;