f84e27adfc
`comedi_read()` initializes `retval` to 0. The other `retval = 0` assignments are superfluous, so remove them. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>