phy: sun9i-usb: fix error handling

This is likely that checking 'phy->hsic_clk' instead of 'phy->clk' is
expected here.

Signed-off-by: Christophe JAILLET <[e-mail]>
Acked-by: Chen-Yu Tsai <[e-mail]
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/phy-sun9i-usb.c

···
 		}
 
 		phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
-		if (IS_ERR(phy->clk)) {
+		if (IS_ERR(phy->hsic_clk)) {
 			dev_err(dev, "failed to get hsic_12M clock\n");
-			return PTR_ERR(phy->clk);
+			return PTR_ERR(phy->hsic_clk);
 		}
 
 		phy->reset = devm_reset_control_get(dev, "hsic");