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staging: comedi: dt9812: cleanup analog out subdevice (*insn_write)
For aesthetic reasons, rename the function to help with grepping and
rename some of the local vars.
The dt9812_analog_out() function can fail. Make sure to check for any
failure and return the errno.
The comedi core expects the (*insn_write) functions to return either
an errno or the number of samples written. 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>