staging: comedi: quatech_daqp_cs: fix no-op loop daqp_ao_insn_write()

There is a '>' vs '<' typo so this loop is a no-op.

Fixes: d35dcc89 ("staging: comedi: quatech_daqp_cs: fix daqp_ao_insn_write()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>