broadcom: bcm54xx_shadow_read() errors ignored in bcm54xx_adjust_rxrefclk()

If not signed read errors are ignored.
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Acked-by: NMatt Carlson <mcarlson@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/phy/broadcom.c

@@ -326,7 +326,8 @@ static int bcm54xx_phydsp_config(struct phy_device *phydev)
 
 static void bcm54xx_adjust_rxrefclk(struct phy_device *phydev)
 {
-	u32 val, orig;
+	u32 orig;
+	int val;
 	bool clk125en = true;
 
 	/* Abort if we are using an untested phy. */