staging: rtl8188eu: fix missing unlock on error in rtw_resume_process()

Add the missing unlock before return from function
rtw_resume_process() in the error handling case.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/os_dep/usb_intf.c

@@ -315,8 +315,10 @@ static int rtw_resume_process(struct adapter *padapter)
 
 	ret = 0;
 exit:
-	if (pwrpriv)
+	if (pwrpriv) {
 		pwrpriv->bInSuspend = false;
+		mutex_unlock(&pwrpriv->mutex_lock);
+	}
 	pr_debug("<===  %s return %d.............. in %dms\n", __func__,
 		ret, jiffies_to_msecs(jiffies - start_time));