mac80211: fix the increment of unicast/multicast counters for forwarded PREQ

Forwarded PREQ is either unicast or multicast. The appropriate counters
should be incremented accordingly.
Signed-off-by: NChun-Yeow Yeoh <yeohchunyeow@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/mac80211/mesh_hwmp.c

@@ -603,7 +603,10 @@ static void hwmp_preq_frame_process(struct ieee80211_sub_if_data *sdata,
 				hopcount, ttl, cpu_to_le32(lifetime),
 				cpu_to_le32(metric), cpu_to_le32(preq_id),
 				sdata);
-		ifmsh->mshstats.fwded_mcast++;
+		if (!is_multicast_ether_addr(da))
+			ifmsh->mshstats.fwded_unicast++;
+		else
+			ifmsh->mshstats.fwded_mcast++;
 		ifmsh->mshstats.fwded_frames++;
 	}
 }