net: ethernet: ti: Use ERR_CAST instead of ERR_PTR(PTR_ERR())

Use ERR_CAST inlined function instead of ERR_PTR(PTR_ERR(...)).

drivers/net/ethernet/ti/cpts.c:567:9-16: WARNING: ERR_CAST can be used with cpts->refclk
Generated by: scripts/coccinelle/api/err_cast.cocci
Signed-off-by: NHernán Gonzalez <hernan@vanguardiasur.com.ar>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/cpts.c

@@ -564,7 +564,7 @@ struct cpts *cpts_create(struct device *dev, void __iomem *regs,
 	cpts->refclk = devm_clk_get(dev, "cpts");
 	if (IS_ERR(cpts->refclk)) {
 		dev_err(dev, "Failed to get cpts refclk\n");
-		return ERR_PTR(PTR_ERR(cpts->refclk));
+		return ERR_CAST(cpts->refclk);
 	}
 
 	clk_prepare(cpts->refclk);