rt2x00: Remove superfluous assignment of mpdu_density

The tx desciptor already gets initialized to 0. Hence, there's no need
to explicitly assign 0 to mpdu_density here.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00ht.c

@@ -40,8 +40,6 @@ void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
 	if (tx_info->control.sta)
 		txdesc->mpdu_density =
 		    tx_info->control.sta->ht_cap.ampdu_density;
-	else
-		txdesc->mpdu_density = 0;
 
 	txdesc->ba_size = 7;	/* FIXME: What value is needed? */