staging: comedi: ni_at_a2150: introduce a2150_free_dma()
For aesthetics, introduce a helper function to free the DMA channel and buffer. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Reviewed-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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