zd1211rw: Fixed incorrect constant name.

Trial and error reveals that CR_ZD1211B_TX_PWR_CTL* do not affect the
transmission power.  Instead these registers seem to control the contention
windows limits for different QoS access categories.
Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_chip.c

@@ -771,10 +771,10 @@ static int zd1211b_hw_init_hmac(struct zd_chip *chip)
 {
 	static const struct zd_ioreq32 ioreqs[] = {
 		{ CR_ZD1211B_RETRY_MAX,		0x02020202 },
-		{ CR_ZD1211B_TX_PWR_CTL4,	0x007f003f },
-		{ CR_ZD1211B_TX_PWR_CTL3,	0x007f003f },
-		{ CR_ZD1211B_TX_PWR_CTL2,       0x003f001f },
-		{ CR_ZD1211B_TX_PWR_CTL1,       0x001f000f },
+		{ CR_ZD1211B_CWIN_MAX_MIN_AC0,	0x007f003f },
+		{ CR_ZD1211B_CWIN_MAX_MIN_AC1,	0x007f003f },
+		{ CR_ZD1211B_CWIN_MAX_MIN_AC2,  0x003f001f },
+		{ CR_ZD1211B_CWIN_MAX_MIN_AC3,  0x001f000f },
 		{ CR_ZD1211B_AIFS_CTL1,		0x00280028 },
 		{ CR_ZD1211B_AIFS_CTL2,		0x008C003C },
 		{ CR_ZD1211B_TXOP,		0x01800824 },

drivers/net/wireless/zd1211rw/zd_chip.h

@@ -625,11 +625,10 @@ enum {
 #define CR_S_MD				CTL_REG(0x0830)
 
 #define CR_USB_DEBUG_PORT		CTL_REG(0x0888)
-
-#define CR_ZD1211B_TX_PWR_CTL1		CTL_REG(0x0b00)
-#define CR_ZD1211B_TX_PWR_CTL2		CTL_REG(0x0b04)
-#define CR_ZD1211B_TX_PWR_CTL3		CTL_REG(0x0b08)
-#define CR_ZD1211B_TX_PWR_CTL4		CTL_REG(0x0b0c)
+#define CR_ZD1211B_CWIN_MAX_MIN_AC0	CTL_REG(0x0b00)
+#define CR_ZD1211B_CWIN_MAX_MIN_AC1	CTL_REG(0x0b04)
+#define CR_ZD1211B_CWIN_MAX_MIN_AC2	CTL_REG(0x0b08)
+#define CR_ZD1211B_CWIN_MAX_MIN_AC3	CTL_REG(0x0b0c)
 #define CR_ZD1211B_AIFS_CTL1		CTL_REG(0x0b10)
 #define CR_ZD1211B_AIFS_CTL2		CTL_REG(0x0b14)
 #define CR_ZD1211B_TXOP			CTL_REG(0x0b20)