[USB] Fix EPO STALL issue in STM32 USB Device library

USB Specification EP0 should never STALL during setup stage.
Device is not properly setup if STALL present.

Fixes #664

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

system/Middlewares/ST/STM32_USB_Device_Library/Core/Src/usbd_core.c

@@ -393,12 +393,14 @@ USBD_StatusTypeDef USBD_LL_DataInStage(USBD_HandleTypeDef *pdev,
         }
         else
         {
-          if ((pdev->pClass->EP0_TxSent != NULL) &&
-              (pdev->dev_state == USBD_STATE_CONFIGURED))
+          if (pdev->dev_state == USBD_STATE_CONFIGURED)
           {
-            pdev->pClass->EP0_TxSent(pdev);
+            if (pdev->pClass->EP0_TxSent != NULL)
+            {
+              pdev->pClass->EP0_TxSent(pdev);
+            }
+            USBD_LL_StallEP(pdev, 0x80U);
           }
-          USBD_LL_StallEP(pdev, 0x80U);
           USBD_CtlReceiveStatus(pdev);
         }
       }