Check clock-enable failures after a manually managed allocation.

Release the earlier allocation and return the original clock error when
probe cannot enable the clock.

Signed-off-by: jiawen <1298662399@qq.com>
---
diff --git a/drivers/gpu/ipu-v3/ipu-pre.c b/drivers/gpu/ipu-v3/ipu-pre.c
--- a/drivers/gpu/ipu-v3/ipu-pre.c
+++ b/drivers/gpu/ipu-v3/ipu-pre.c
@@ -311,6 +311,7 @@
 {
 	struct device *dev = &pdev->dev;
 	struct ipu_pre *pre;
+	int ret;
 
 	pre = devm_kzalloc(dev, sizeof(*pre), GFP_KERNEL);
 	if (!pre)
@@ -339,7 +340,12 @@
 	if (!pre->buffer_virt)
 		return -ENOMEM;
 
-	clk_prepare_enable(pre->clk_axi);
+	ret = clk_prepare_enable(pre->clk_axi);
+	if (ret) {
+		gen_pool_free(pre->iram, (unsigned long)pre->buffer_virt,
+			      IPU_PRE_MAX_WIDTH * IPU_PRE_NUM_SCANLINES * 4);
+		return ret;
+	}
 
 	pre->dev = dev;
 	platform_set_drvdata(pdev, pre);