rt2x00: Fix for rt2800usb for SHARED_KEY_TABLE initializations

Fixed comments about SHARED_KEY_TABLE_BASE and SHARED_KEY_MODE_BASE.
Fixed initialization loop for SHARED_KEY_MODE_ENTRY.

Based on a patch for rt2800pci from Benoit.

Signed-off-by: Benoit PAPILLAULT <benoit.papillault@free.fr>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index 3856f06..c82474e 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -1463,6 +1463,10 @@
 	/*
 	 * ASIC will keep garbage value after boot, clear encryption keys.
 	 */
+	for (i = 0; i < 4; i++)
+		rt2x00usb_register_write(rt2x00dev,
+					 SHARED_KEY_MODE_ENTRY(i), 0);
+
 	for (i = 0; i < 256; i++) {
 		u32 wcid[2] = { 0xffffffff, 0x00ffffff };
 		rt2x00usb_register_multiwrite(rt2x00dev, MAC_WCID_ENTRY(i),
@@ -1472,10 +1476,6 @@
 		rt2x00usb_register_write(rt2x00dev, MAC_IVEIV_ENTRY(i), 0);
 	}
 
-	for (i = 0; i < 16; i++)
-		rt2x00usb_register_write(rt2x00dev,
-					 SHARED_KEY_MODE_ENTRY(i), 0);
-
 	/*
 	 * Clear all beacons
 	 * For the Beacon base registers we only need to clear