staging: comedi: rti800: swap val and mask when reading ai data

The (mask & val) operation when reading the high 4-bits of the analog
data looks strange. Change it to (val & mask).

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed