devices: tap API cleanup

Use consistent API types.

Type: fix

Change-Id: I11cc7f6347b7a60e5fd41e54f0c7994e2d81199f
Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
diff --git a/src/vnet/devices/tap/cli.c b/src/vnet/devices/tap/cli.c
index abec8f0..a85fcbf 100644
--- a/src/vnet/devices/tap/cli.c
+++ b/src/vnet/devices/tap/cli.c
@@ -90,7 +90,7 @@
 	  else if (unformat (line_input, "gso"))
 	    args.tap_flags |= TAP_FLAG_GSO;
 	  else if (unformat (line_input, "hw-addr %U",
-			     unformat_ethernet_address, args.mac_addr))
+			     unformat_ethernet_address, args.mac_addr.bytes))
 	    args.mac_addr_set = 1;
 	  else
 	    {