[PATCH] usb: xhci-mtk: fix ptr_ret.cocci warnings

[kbuild test robot]

drivers/usb/host/xhci-mtk.c:256:1-3: WARNING: PTR_ERR_OR_ZERO can be used


 Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: scripts/coccinelle/api/ptr_ret.cocci

Fixes: b6bb72cf0df1 ("usb: xhci-mtk: add optional mcu and dma bus clocks")
CC: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---

 xhci-mtk.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -253,10 +253,7 @@ static int xhci_mtk_clks_get(struct xhci
 		return PTR_ERR(mtk->mcu_clk);
 
 	mtk->dma_clk = optional_clk_get(dev, "dma_ck");
-	if (IS_ERR(mtk->dma_clk))
-		return PTR_ERR(mtk->dma_clk);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(mtk->dma_clk);
 }
 
 static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk)