phy: brcm-sata: remove unused variable

The newly introduced calibrate function has a variable
that has never been used and needs to be removed to avoid
this harmless warning:

drivers/phy/broadcom/phy-brcm-sata.c: In function 'brcm_stb_sata_calibrate':
drivers/phy/broadcom/phy-brcm-sata.c:514:24: error: unused variable 'priv' [-Werror=unused-variable]

Fixes: 3e507769 ("phy: brcm-sata: Implement calibrate callback")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/phy/broadcom/phy-brcm-sata.c

@@ -511,7 +511,6 @@ static int brcm_sata_phy_init(struct phy *phy)
 static void brcm_stb_sata_calibrate(struct brcm_sata_port *port)
 {
 	void __iomem *base = brcm_sata_pcb_base(port);
-	struct brcm_sata_phy *priv = port->phy_priv;
 	u32 tmp = BIT(8);
 
 	brcm_sata_phy_wr(base, RXPMD_REG_BANK, RXPMD_RX_FREQ_MON_CONTROL1,