[components][dfs]修复FATFS文件系统使用cat命令导致断言bug

components/dfs/dfs_v1/filesystems/elmfat/dfs_elm.c

@@ -349,7 +349,6 @@ int dfs_elm_open(struct dfs_file *file)
             return -ENOENT;
         }
         file->pos = 0;
-        return 0;
     }
 
     if (fs == NULL)