fwcontrol with MPEG TS and autodetection support

[Petr Holub]

I've encountered one problem with the patch I've sent a while ago.
The receiving process after the autodetection generates the
following message:
fwohci0: IR DMA no free chunk
fwohci0: IR DMA overrun (0x40008011)
I think I can aviod it by re-opening the device but I would like
to
a) know what happens (is it related to the nchunk variable I don't
   understand?)
b) avoid it in some cleaner way.

Petr