flash_read() updates file->f_pos directly instead of the ppos given.  The
VFS later updates the file->f_pos and overwrites it with the unchanged
value of ppos.
Signed-off-by: NJan Blunck <jblunck@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>