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staging: comedi: ni_tio: Use data[insn->n-1] in ni_tio_insn_write()
The `insn_write` handler for the counter subdevices (`ni_tio_insn_write()`) writes a single data value `data[0]` to the channel. Technically, `insn->n` specifies the number of successive values from `data[]` to write to the channel, but when there is little benefit in writing multiple data values, the usual Comedi convention is to just write the last data value `data[insn->n - 1]`. Change the function to follow that convention and use `data[insn->n - 1]` instead of `data[0]`. (In practice, `insn->n` would normally be 1 anyway.) Also follow the usual Comedi convention and return `insn->n` from the handler to indicate success instead of 0 (although any non-negative return value will do). Signed-off-by:Ian Abbott <abbotti@mev.co.uk> Signed-off-by: