ERROR: column "only_protected_branches" of relation "remote_mirrors" already exists / Job Failed #67471572

Job #67471572 failed for d32010bd:

GitLab CE -> GitLab EE upgrade fails:

PG::DuplicateColumn: ERROR:  column "only_protected_branches" of relation "remote_mirrors" already exists
: ALTER TABLE "remote_mirrors" ADD "only_protected_branches" boolean
/opt/gitlab/embedded/service/gitlab-rails/config/initializers/postgresql_limit_fix.rb:6:in `add_column'
/opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/database/migration_helpers.rb:376:in `block in add_column_with_default'
/opt/gitlab/embedded/service/gitlab-rails/lib/gitlab/database/migration_helpers.rb:372:in `add_column_with_default'
/opt/gitlab/embedded/service/gitlab-rails/ee/db/migrate/20171110152729_add_only_protected_branches_to_remote_mirrors.rb:9:in `up'

/cc @DouweM