vcl: update buf if whole buf cannot be done at once

Change-Id: I0d56d2cee012b46da848362f322d6f246f8bf4c2
Signed-off-by: wuzhouhui <wuzhouhui14@mails.ucas.ac.cn>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/vcl/vcl_test.h b/src/vcl/vcl_test.h
index 638d519d95c..cb38f291cfb 100644
--- a/src/vcl/vcl_test.h
+++ b/src/vcl/vcl_test.h
@@ -509,6 +509,7 @@ vcl_test_write (int fd, uint8_t * buf, uint32_t nbytes,
       if (tx_bytes != nbytes)
 	{
 	  nbytes_left = nbytes_left - rv;
+	  buf += rv;
 	  if (stats)
 	    stats->tx_incomp++;
 	}