platform/x86: samsung-laptop: Initialize loca variable

platform/x86: samsung-laptop: Initialize loca variable

commit 0d2c95354a3b63256e92d9fb865c08902d2c9b0b upstream.

The variable is used uninitialized which might come into unexpected
behaviour on some Samsung laptops.

Initialize it to 0xffff which seems a proper value for non-supported
feature.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>