fix usage string missing arg

Change-Id: I9710e9ed6ceff6c0b2de0bcf77f355762df88b58
Signed-off-by: Jerome Tollet <jtollet@cisco.com>

diff --git a/src/tests/vnet/session/tcp_echo.c b/src/tests/vnet/session/tcp_echo.c
index e8868ed..9329189 100644 (file)
--- a/src/tests/vnet/session/tcp_echo.c
+++ b/src/tests/vnet/session/tcp_echo.c
@@ -1439,7 +1439,7 @@ main (int argc, char **argv)
        ;
       else
        {
-         fformat (stderr, "%s: usage [master|slave]\n");
+         fformat (stderr, "%s: usage [master|slave]\n", argv[0]);
          exit (1);
        }
     }