core/device: Fix build on some platforms

due to type promotions in C this code was failing on some platforms.

Change-Id: Icf69d7708568f784f0a9d86e8c5ff462ac802fca
Reviewed-on: https://chromium-review.googlesource.com/306772
Reviewed-by: Arman Uguray <armansito@chromium.org>
Tested-by: Arman Uguray <armansito@chromium.org>
1 file changed