cbfstool: add the missing 'break'

The previous patch introduced a bug where the new added case statement
was missing the break. There was no problem testing, because an
unrelated parameter structure field was being modified as a result.

BRANCH=storm
BUG=none
TEST=compiles and runs

Change-Id: Ib3e6c4c2b5c37588c612b8ab2672f6845c1b4ecb
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/239598
Reviewed-by: Julius Werner <jwerner@chromium.org>
1 file changed