Add a few 'const's.

These are useful hints, in these cases, that the caller retains ownership
of the passed-in packets.

Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/dpif.c b/lib/dpif.c
index 37c00128..56bb1ad6 100644
--- a/lib/dpif.c
+++ b/lib/dpif.c
@@ -675,7 +675,7 @@ dpif_port_poll_wait(const struct dpif *dpif)
  * arguments must have been initialized through a call to flow_extract().
  */
 void
-dpif_flow_stats_extract(const struct flow *flow, struct ofpbuf *packet,
+dpif_flow_stats_extract(const struct flow *flow, const struct ofpbuf *packet,
                         struct dpif_flow_stats *stats)
 {
     memset(stats, 0, sizeof(*stats));