[PATCH] usb: hcd: fix the error check

[Tang Bin]

In the function usb_add_hcd(), usb_phy_roothub_alloc()
can return NULL in some cases, so IS_ERR() doesn't meet
the requirements. Thus fix it.
Signed-off-by: Zhang Shengju <zhangshengju@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Tang Bin <tangbin@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/core/hcd.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index aa45840d8..b73a92ee1 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2633,8 +2633,9 @@ int usb_add_hcd(struct usb_hcd *hcd,
 
 	if (!hcd->skip_phy_initialization && usb_hcd_is_primary_hcd(hcd)) {
 		hcd->phy_roothub = usb_phy_roothub_alloc(hcd->self.sysdev);
-		if (IS_ERR(hcd->phy_roothub))
-			return PTR_ERR(hcd->phy_roothub);
+		if (IS_ERR_OR_NULL(hcd->phy_roothub))
+			return hcd->phy_roothub ?
+					PTR_ERR(hcd->phy_roothub) : -ENODEV;
 
 		retval = usb_phy_roothub_init(hcd->phy_roothub);
 		if (retval)
-- 
2.20.1.windows.1