mac80211: Only process mesh PREPs with equal seq number if metric is better.

This fixes routing loops in PREP propagation and is in accordance with Draft
11, Section: 11C.9.8.4.

Signed-off-by: Fabrice Deyber <fabricedeyber@agilemesh.com>
Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/mesh_hwmp.c

@@ -391,7 +391,6 @@ static u32 hwmp_route_info_get(struct ieee80211_sub_if_data *sdata,
 			    (mpath->flags & MESH_PATH_SN_VALID)) {
 				if (SN_GT(mpath->sn, orig_sn) ||
 				    (mpath->sn == orig_sn &&
-				     action == MPATH_PREQ &&
 				     new_metric >= mpath->metric)) {
 					process = false;
 					fresh_info = false;