staging: comedi: cb_pcidas64: Use insn->n in AO insn_write handler
The `insn_write` handler for the AO subdevice (`ao_winsn()` currently
ignores `insn->n` (the number of samples to write) and assumes a single
sample is to be written. But `insn->n` could be 0, meaning no samples
should be written, in which case `data[0]` is invalid.
Follow the usual Comedi guidelines and change `ao_winsn()` to write the
specified number of samples. This fixes the assumption that `data[0]`
is valid.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>