Staging: comedi: fix spacing/style problem in das1800.c (and das6402.c)

This patch fixes a style issue regarding asterisk placement in
das1800.c and das6402.c found by checkpatch.pl.

Signed-off-by: Chase Southwood <chase.southwood@yahoo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>