Staging: comedi: fix code warnings in s626.c

A patch for s626.c to fix some of the warnings
reported by the checkpatch.pl tool, namely,
-suspect code indent for conditional statements
-please, no space before tabs

Signed-off-by: John Sheehan <john.d.sheehan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>