rt2800usb: use rt2x00usb_register_multiwrite() to set key entries

Since struct hw_key_entry is 32-bytes large and is smaller than
CSR cache size (which is 64-bytes large) we can use the standard
rt2x00usb_register_multiwrite() helper to set key entries.

This cleanup is a part of preparations for later code unification.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800usb.c

@@ -392,7 +392,6 @@ static int rt2800usb_config_shared_key(struct rt2x00_dev *rt2x00dev,
 {
 	struct hw_key_entry key_entry;
 	struct rt2x00_field32 field;
-	int timeout;
 	u32 offset;
 	u32 reg;
 
@@ -407,12 +406,8 @@ static int rt2800usb_config_shared_key(struct rt2x00_dev *rt2x00dev,
 		       sizeof(key_entry.rx_mic));
 
 		offset = SHARED_KEY_ENTRY(key->hw_key_idx);
-		timeout = REGISTER_TIMEOUT32(sizeof(key_entry));
-		rt2x00usb_vendor_request_large_buff(rt2x00dev, USB_MULTI_WRITE,
-						    USB_VENDOR_REQUEST_OUT,
-						    offset, &key_entry,
-						    sizeof(key_entry),
-						    timeout);
+		rt2x00usb_register_multiwrite(rt2x00dev, offset,
+					      &key_entry, sizeof(key_entry));
 	}
 
 	/*
@@ -445,7 +440,6 @@ static int rt2800usb_config_pairwise_key(struct rt2x00_dev *rt2x00dev,
 					 struct ieee80211_key_conf *key)
 {
 	struct hw_key_entry key_entry;
-	int timeout;
 	u32 offset;
 
 	if (crypto->cmd == SET_KEY) {
@@ -467,12 +461,8 @@ static int rt2800usb_config_pairwise_key(struct rt2x00_dev *rt2x00dev,
 		       sizeof(key_entry.rx_mic));
 
 		offset = PAIRWISE_KEY_ENTRY(key->hw_key_idx);
-		timeout = REGISTER_TIMEOUT32(sizeof(key_entry));
-		rt2x00usb_vendor_request_large_buff(rt2x00dev, USB_MULTI_WRITE,
-						    USB_VENDOR_REQUEST_OUT,
-						    offset, &key_entry,
-						    sizeof(key_entry),
-						    timeout);
+		rt2x00usb_register_multiwrite(rt2x00dev, offset,
+					      &key_entry, sizeof(key_entry));
 	}
 
 	/*