brcmsmac: fix read in write_phy_reg

This reverts a unintended change mad in commit.
commit 4b006b11ca18995677c5f1cd03cc9c42fbe80693
Author: Arend van Spriel <arend@broadcom.com>
Date:   Thu Dec 8 15:06:54 2011 -0800

    brcm80211: smac: use bcma functions for register access in phy code

Acked-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmsmac/phy/phy_cmn.c

@@ -292,7 +292,7 @@ void write_phy_reg(struct brcms_phy *pi, u16 addr, u16 val)
 	bcma_wflush16(pi->d11core, D11REGOFFS(phyregaddr), addr);
 	bcma_write16(pi->d11core, D11REGOFFS(phyregdata), val);
 	if (addr == 0x72)
-		(void)bcma_read16(pi->d11core, D11REGOFFS(phyversion));
+		(void)bcma_read16(pi->d11core, D11REGOFFS(phyregdata));
 #else
 	bcma_write32(pi->d11core, D11REGOFFS(phyregaddr), addr | (val << 16));
 	if (++pi->phy_wreg >= pi->phy_wreg_limit) {