media: v4l: cadence: Handle errors of clk_prepare_enable()

Handle errors of clk_prepare_enable() in csi2rx_get_resources().

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/cadence/cdns-csi2rx.c

@@ -282,6 +282,7 @@ static int csi2rx_get_resources(struct csi2rx_priv *csi2rx,
 	struct resource *res;
 	unsigned char i;
 	u32 dev_cfg;
+	int ret;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	csi2rx->base = devm_ioremap_resource(&pdev->dev, res);
@@ -315,7 +316,12 @@ static int csi2rx_get_resources(struct csi2rx_priv *csi2rx,
 		return -EINVAL;
 	}
 
-	clk_prepare_enable(csi2rx->p_clk);
+	ret = clk_prepare_enable(csi2rx->p_clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't prepare and enable P clock\n");
+		return ret;
+	}
+
 	dev_cfg = readl(csi2rx->base + CSI2RX_DEVICE_CFG_REG);
 	clk_disable_unprepare(csi2rx->p_clk);