ath5k: set short preamble flag for rx

set the short preamble flag in ieee80211_rx_status for frames received with a
short preamble.

drivers/net/wireless/ath5k/base.c:      Changes-licensed-under: 3-Clause-BSD

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath5k/base.c

@@ -1763,12 +1763,10 @@ accept:
 		rxs.rate_idx = ath5k_hw_to_driver_rix(sc, rs.rs_rate);
 		rxs.flag |= ath5k_rx_decrypted(sc, ds, skb, &rs);
 
-#if 0		/* add rxs.flag SHORTPRE once it is in mac80211 */
-		if (rs.rs_rate >= ATH5K_RATE_CODE_2M &&
-		    rs.rs_rate <= ATH5K_RATE_CODE_11M &&
-		    rs.rs_rate & AR5K_SET_SHORT_PREAMBLE)
+		if (rxs.rate_idx >= 0 && rs.rs_rate ==
+		    sc->curband->bitrates[rxs.rate_idx].hw_value_short)
 			rxs.flag |= RX_FLAG_SHORTPRE;
-#endif
+
 		ath5k_debug_dump_skb(sc, skb, "RX  ", 0);
 
 		/* check beacons in IBSS mode */