[libsoup] soup-logger: fix -Wformat-nonliteral warnings in clang

[Dan Winship <danw src gnome org>]

commit 3c96f1977a556b76bc768edeb78497a2e92dd898
Author: Dan Winship <danw gnome org>
Date:   Thu Oct 17 17:56:29 2013 -0400

    soup-logger: fix -Wformat-nonliteral warnings in clang

 configure.ac          |    1 +
 libsoup/soup-logger.c |    5 ++++-
 2 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f498b96..3759bab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -340,6 +340,7 @@ if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
                -Wall -Wstrict-prototypes -Werror=missing-prototypes \
                -Werror=implicit-function-declaration \
                -Werror=pointer-arith -Werror=init-self -Werror=format=2 \
+               -Wno-format-zero-length \
                -Werror=missing-include-dirs -Werror=aggregate-return \
                -Werror=declaration-after-statement"
 fi
diff --git a/libsoup/soup-logger.c b/libsoup/soup-logger.c
index a441f21..34a5576 100644
--- a/libsoup/soup-logger.c
+++ b/libsoup/soup-logger.c
@@ -374,6 +374,9 @@ soup_logger_detach (SoupLogger  *logger,
        soup_session_remove_feature (session, SOUP_SESSION_FEATURE (logger));
 }
 
+static void soup_logger_print (SoupLogger *logger, SoupLoggerLogLevel level,
+                              char direction, const char *format, ...) G_GNUC_PRINTF (4, 5);
+
 static void
 soup_logger_print (SoupLogger *logger, SoupLoggerLogLevel level,
                   char direction, const char *format, ...)
@@ -434,7 +437,7 @@ soup_logger_print_basic_auth (SoupLogger *logger, const char *value)
                        *p = '*';
        }
        soup_logger_print (logger, SOUP_LOGGER_LOG_HEADERS, '>',
-                          "Authorization: Basic [%.*s]", len, decoded);
+                          "Authorization: Basic [%.*s]", (int)len, decoded);
        g_free (decoded);
 }