mac80211: don't start dynamic PS timer if not needed

If the device implements dynamic PS itself, there's no need
to ever start the dynamic powersave timer on RX.

While at it, fix up some indentation in this code.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/rx.c

@@ -2474,14 +2474,14 @@ ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
 
 	rx->skb->dev = dev;
 
-	if (local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
+	if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
+	    local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 &&
 	    !is_multicast_ether_addr(
 		    ((struct ethhdr *)rx->skb->data)->h_dest) &&
 	    (!local->scanning &&
-	     !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) {
+	     !test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)))
 		mod_timer(&local->dynamic_ps_timer, jiffies +
 			  msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
-	}
 
 	ieee80211_deliver_skb(rx);