staging: comedi: icp_multi: fix clock comment CodingStyle

Reword the block comment to fix a CodingStyle issue.

For aesthetics, also rename the icp_multi_ao_eoc() function. It's testing
for the analog output to be 'ready' not for an 'end-of-conversion'.

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>