buffers: fix vector types

Change-Id: I9df96264e30806ac3daf7121f314f34f06232413
Signed-off-by: Damjan Marion <damjan.marion@gmail.com>
diff --git a/src/vlib/buffer.h b/src/vlib/buffer.h
index 095c09d..f7fdf20 100644
--- a/src/vlib/buffer.h
+++ b/src/vlib/buffer.h
@@ -178,10 +178,10 @@
   u8x16 as_u8x16[4];
 #endif
 #ifdef CLIB_HAVE_VEC256
-  u8x16 as_u8x32[2];
+  u8x32 as_u8x32[2];
 #endif
 #ifdef CLIB_HAVE_VEC512
-  u8x16 as_u8x64[1];
+  u8x64 as_u8x64[1];
 #endif
 } vlib_buffer_t;