Staging: comedi: Indentation issue in mpc624.c

This is a patch to the mpc624.c file that fixes up a
WARNING: 'Statements should start on a tabstop' found by
the checkpatch.pl tool.

Signed-off-by: Ravishankar Karkala Mallikarjunayya <ravishankarkm32@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>