staging: comedi: pcl818: only init async command members when needed
The 'len_chanlist' and 'cancel' members of the comedi_subdevice are only used with async command support. Only initialize them if the irq was sucessfully requested. 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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