UPSTREAM: core/service: Fix calling driver .accept multiple times

service_accept shall not call driver .accept callback multiple times.

BUG=chromium:547822

Change-Id: I59869764c6ec3ae26dee73a606905d84315cf317
Reviewed-on: https://chromium-review.googlesource.com/308737
Commit-Ready: Jakub x Jakub Pawlowski <jpawlowski@chromium.org>
Tested-by: Jakub x Jakub Pawlowski <jpawlowski@chromium.org>
Reviewed-by: Arman Uguray <armansito@chromium.org>
Reviewed-by: Jakub x Jakub Pawlowski <jpawlowski@chromium.org>
1 file changed