[PATCH -next] staging: r8188eu: fix missing unlock in rtw_resume()

[Yang Yingliang]

Add the missing unlock before return from rtw_resume().

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/staging/r8188eu/os_dep/usb_intf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/r8188eu/os_dep/usb_intf.c b/drivers/staging/r8188eu/os_dep/usb_intf.c
index 6b93830130e7..5a35d9fe3fc9 100644
--- a/drivers/staging/r8188eu/os_dep/usb_intf.c
+++ b/drivers/staging/r8188eu/os_dep/usb_intf.c
@@ -298,8 +298,10 @@ static int rtw_resume(struct usb_interface *pusb_intf)
 		pwrpriv->bkeepfwalive = false;
 
 	DBG_88E("bkeepfwalive(%x)\n", pwrpriv->bkeepfwalive);
-	if (pm_netdev_open(pnetdev, true) != 0)
+	if (pm_netdev_open(pnetdev, true) != 0) {
+		mutex_unlock(&pwrpriv->lock);
 		goto exit;
+	}
 
 	netif_device_attach(pnetdev);
 	netif_carrier_on(pnetdev);
-- 
2.25.1