[PATCH] net: fix build with -Wpedantic

[Ali Alnubani <alialnu@nvidia.com>]

Adds the __extension__ attribute to resolve the following warning
with gcc 4.8.5 on CentOS 7:
lib/net/rte_macsec.h:38:2: error: type of bit-field 'short_length' is
  a GCC extension [-Werror=pedantic]

Fixes: 0aaf097585a6 ("ethdev: add MACsec flow item")
Cc: gakhil@marvell.com

Signed-off-by: Ali Alnubani <alialnu@nvidia.com>
---
 lib/net/rte_macsec.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/net/rte_macsec.h b/lib/net/rte_macsec.h
index 9228ebd083..d0cd2f69ab 100644
--- a/lib/net/rte_macsec.h
+++ b/lib/net/rte_macsec.h
@@ -28,6 +28,7 @@ extern "C" {
 /**
  * MACsec Header (SecTAG)
  */
+__extension__
 struct rte_macsec_hdr {
 	/**
 	 * Tag control information and Association number of secure channel.
-- 
2.25.1