Protect sink addition/removal with a mutex
Protect sink addition/removal with a mutex

ahmedammar/skype_farsight2,pexip/farstream,ahmedammar/skype_farsight2,tieto/farstream,pexip/farstream,tieto/farstream,pexip/farstream,tieto/farstream,tieto/farstream,pexip/farstream,ahmedammar/skype_farsight2,ahmedammar/skype_farsight2,kakaroto/farstream,shadeslayer/farstream,kakaroto/farstream,kakaroto/farstream,shadeslayer/farstream,shadeslayer/farstream,shadeslayer/farstream,tieto/farstream,kakaroto/farstream