staging: comedi: me4000: use bitwise AND instead of logical

This was supposed to bitwise AND but there is a typo.

Fixes: 1a023870 ('staging: comedi: me4000: remove 'board' from me4000_ai_insn_read()')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>