!613 解决sd卡读写操作时对卡进行热插拔后，disk资源未释放问题

Merge pull request !613 from 董逸群/OpenHarmony_1.0.1_release

fs/vfs/disk/disk.c

@@ -1279,20 +1279,20 @@ static INT32 DiskDeinit(los_disk *disk)
 #endif
 
     disk->dev = NULL;
-    DISK_UNLOCK(&disk->disk_mutex);
+
     (VOID)unregister_blockdriver(disk->disk_name);
     if (disk->disk_name != NULL) {
         LOS_MemFree(m_aucSysMem0, disk->disk_name);
         disk->disk_name = NULL;
     }
+    DISK_UNLOCK(&disk->disk_mutex);
+    disk->disk_status = STAT_UNUSED;
     ret = pthread_mutex_destroy(&disk->disk_mutex);
     if (ret != 0) {
         PRINT_ERR("%s %d, mutex destroy failed, ret = %d\n", __FUNCTION__, __LINE__, ret);
         return -EFAULT;
     }
 
-    disk->disk_status = STAT_UNUSED;
-
     return ENOERR;
 }