cros_sample_getcwd02: fix const warning

BUG=chromium:465038
TEST=building for x86 still works

Change-Id: Id1c49fc55e080b369a88456cfc1360ed40e8195f
Reviewed-on: https://chromium-review.googlesource.com/257521
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed