chan->count is used by rx channel. If the desc count is not updated by
the clean up loop in cpdma_chan_stop, the value written to the rxfree
register in cpdma_chan_start will be incorrect.
Signed-off-by: NTao Hou <hotforest@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>