Patched for Audio example - Add status check when DFSDM's filter and channel de-init.

Dependents:   DISCO_F413ZH-AUDIO-demo

The base repository is https://os.mbed.com/teams/ST/code/BSP_DISCO_F413ZH/. I've just added workaround patch for Audio-in demo on DISCO_F413ZH board(Microphone U16, U17)

Revision:
3:42b354f5069c
Parent:
0:4af3ca173992
--- a/Drivers/BSP/STM32F413H-Discovery/stm32f413h_discovery_qspi.c	Tue May 23 11:03:57 2017 +0200
+++ b/Drivers/BSP/STM32F413H-Discovery/stm32f413h_discovery_qspi.c	Wed Feb 28 14:35:04 2018 +0100
@@ -2,8 +2,6 @@
   ******************************************************************************
   * @file    stm32f413h_discovery_qspi.c
   * @author  MCD Application Team
-  * @version V1.0.0
-  * @date    27-January-2017
   * @brief   This file includes a standard driver for the N25Q128A QSPI
   *          memory mounted on STM32F413H-DISCOVERY board.
   @verbatim