platform/x86: ISST: use semi-colons instead of commas

The code works the same either way, but it's better to use semi-colons
to separate statements.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210825072357.GA12957@kili


Signed-off-by: Hans de Goede <hdegoede@redhat.com>