rtl8xxxu: remove unused assignment value

at first, ret was assigned to zero, but later assigned to
a funciton,so the assignment to zero is no use, which can
simple be removed instead.
Signed-off-by: wengjianfeng <wengjianfeng@yulong.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210130072310.17252-1-samirweng1979@163.com

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192e.c

@@ -1507,8 +1507,6 @@ static int rtl8192eu_power_on(struct rtl8xxxu_priv *priv)
 	u32 val32;
 	int ret;
 
-	ret = 0;
-
 	val32 = rtl8xxxu_read32(priv, REG_SYS_CFG);
 	if (val32 & SYS_CFG_SPS_LDO_SEL) {
 		rtl8xxxu_write8(priv, REG_LDO_SW_CTRL, 0xc3);