phy: realtek: usb: fix NULL deref in rtk_usb2phy_probe

In rtk_usb2phy_probe() devm_kzalloc() may return NULL
but this returned value is not checked.

Fixes: 134e6d2 ("phy: realtek: usb: Add driver for the Realtek SoC USB 2.0 PHY")
Signed-off-by: Charles Han <hanchunchao@inspur.com>
Link: https://lore.kernel.org/r/20241025065912.143692-1-hanchunchao@inspur.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/phy/realtek/phy-rtk-usb2.c

@@ -1023,6 +1023,8 @@ static int rtk_usb2phy_probe(struct platform_device *pdev)
 
 	rtk_phy->dev			= &pdev->dev;
 	rtk_phy->phy_cfg = devm_kzalloc(dev, sizeof(*phy_cfg), GFP_KERNEL);
+	if (!rtk_phy->phy_cfg)
+		return -ENOMEM;
 
 	memcpy(rtk_phy->phy_cfg, phy_cfg, sizeof(*phy_cfg));