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staging: comedi: dt9812: cleanup analog in subdevice (*insn_read)
For aesthetic reasons, rename the function to help with grepping and
rename some of the local vars.
dt9812_analog_in() can fail. Make sure to check for any failure and
return the errno.
The comedi core expects the (*insn_read) functions to return either
an errno or the number of samples read. Change the final return to
insn->n to make this clearer.
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>