update_kernel_afdo: Fix "no updates"

Exit early if no profiles were updated.

BUG=None
TEST=./update_kernel_afdo --noupload

Change-Id: I1b247379b39b613bd2bc30df3f74cbbc744b2318
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/4237344
Reviewed-by: George Burgess <gbiv@chromium.org>
Tested-by: Denis Nikitin <denik@chromium.org>
Commit-Queue: Denis Nikitin <denik@chromium.org>
1 file changed