[PATCH] phy: realtek: usb: Fix the NULL vs IS_ERR() bug for debugfs_create_dir()

[Jinjie Ruan]

Since both debugfs_create_dir() and debugfs_create_file() return
ERR_PTR and never return NULL, So use IS_ERR() to check it
instead of checking NULL.

Fixes: 134e6d25f6bd ("phy: realtek: usb: Add driver for the Realtek SoC USB 2.0 PHY")
Fixes: adda6e82a7de ("phy: realtek: usb: Add driver for the Realtek SoC USB 3.0 PHY")
Signed-off-by: Jinjie Ruan <ruanjinjie at huawei.com>
---
 drivers/phy/realtek/phy-rtk-usb2.c | 6 +++---
 drivers/phy/realtek/phy-rtk-usb3.c | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/phy/realtek/phy-rtk-usb2.c b/drivers/phy/realtek/phy-rtk-usb2.c
index 5e7ee060b404..67ca78762c80 100644
--- a/drivers/phy/realtek/phy-rtk-usb2.c
+++ b/drivers/phy/realtek/phy-rtk-usb2.c
@@ -853,11 +853,11 @@ static inline void create_debug_files(struct rtk_phy *rtk_phy)
 
 	rtk_phy->debug_dir = debugfs_create_dir(dev_name(rtk_phy->dev),
 						phy_debug_root);
-	if (!rtk_phy->debug_dir)
+	if (IS_ERR(rtk_phy->debug_dir))
 		return;
 
-	if (!debugfs_create_file("parameter", 0444, rtk_phy->debug_dir, rtk_phy,
-				 &rtk_usb2_parameter_fops))
+	if (IS_ERR(debugfs_create_file("parameter", 0444, rtk_phy->debug_dir, rtk_phy,
+				 &rtk_usb2_parameter_fops)))
 		goto file_error;
 
 	return;
diff --git a/drivers/phy/realtek/phy-rtk-usb3.c b/drivers/phy/realtek/phy-rtk-usb3.c
index 7881f908aade..488c749c4edc 100644
--- a/drivers/phy/realtek/phy-rtk-usb3.c
+++ b/drivers/phy/realtek/phy-rtk-usb3.c
@@ -416,11 +416,11 @@ static inline void create_debug_files(struct rtk_phy *rtk_phy)
 		return;
 
 	rtk_phy->debug_dir = debugfs_create_dir(dev_name(rtk_phy->dev), phy_debug_root);
-	if (!rtk_phy->debug_dir)
+	if (IS_ERR(rtk_phy->debug_dir))
 		return;
 
-	if (!debugfs_create_file("parameter", 0444, rtk_phy->debug_dir, rtk_phy,
-				 &rtk_usb3_parameter_fops))
+	if (IS_ERR(debugfs_create_file("parameter", 0444, rtk_phy->debug_dir, rtk_phy,
+				 &rtk_usb3_parameter_fops)))
 		goto file_error;
 
 	return;
-- 
2.34.1