[DFS] remove st_blksize in the struct stat

components/dfs/src/dfs_file.c

@@ -392,7 +392,6 @@ int dfs_file_stat(const char *path, struct stat *buf)
 
         buf->st_size    = 0;
         buf->st_mtime   = 0;
-        buf->st_blksize = 512;
 
         /* release full path */
         rt_free(fullpath);

components/dfs/src/dfs_posix.c

@@ -368,7 +368,6 @@ int fstat(int fildes, struct stat *buf)
 
     buf->st_size    = d->size;
     buf->st_mtime   = 0;
-    buf->st_blksize = 512;
 
     fd_put(d);