staging: comedi: addi_apci_1710: remove dma setup/free code
This driver does not use dma. Remove the code that sets up the dma and allocates the buffers in the attach and the code that frees the buffers in the detach. 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>
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