usb: phy: tegra: Return correct error value provided by clk_get_sys

In case if clk_get_sys fails, return correct error value provided by
the API.
Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/phy/phy-tegra-usb.c

@@ -620,8 +620,7 @@ static int	tegra_phy_init(struct usb_phy *x)
 		phy->clk = clk_get_sys(NULL, ulpi_config->clk);
 		if (IS_ERR(phy->clk)) {
 			pr_err("%s: can't get ulpi clock\n", __func__);
-			err = -ENXIO;
-			goto err1;
+			return PTR_ERR(phy->clk);
 		}
 		if (!gpio_is_valid(ulpi_config->reset_gpio))
 			ulpi_config->reset_gpio =