[patch] Fix for adv_pci1710 with TRIG_WAKE_EOS

Hello,

in the case of using a command with the TRIG_WAKE_EOS flag (in which case
the driver sets the board in the mode where it triggers an interrupt for
every conversion) and multiple channels per scan, the chanlist index
(s->async->cur_chan) was not advanced, which in turn triggered the
PCI171x_PARANOIDCHECK code.

The attached patch fixes this. Please apply :)

so long,

Nils