prevent race condition when attempting to cancel a file upload
prevent race condition when attempting to cancel a file upload

axilleas/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,iiet/iiet-git,iiet/iiet-git,axilleas/gitlabhq,dreampet/gitlab,iiet/iiet-git,jirutka/gitlabhq