rt2x00: Fix typo in rt2800_config_txpower

Fix typo in rt2800_config_txpower.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
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/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index ae20e67..f158322 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -1079,7 +1079,7 @@
 	u8 r1;
 
 	rt2800_bbp_read(rt2x00dev, 1, &r1);
-	rt2x00_set_field8(&reg, BBP1_TX_POWER, 0);
+	rt2x00_set_field8(&r1, BBP1_TX_POWER, 0);
 	rt2800_bbp_write(rt2x00dev, 1, r1);
 
 	rt2800_register_read(rt2x00dev, TX_PWR_CFG_0, &reg);