Caller of check_signature expects a bool
Caller of check_signature expects a bool

The recent changes to the underlying RSA library has
changed the way verify works.  Verify now returns a 1 for
success, yet callers to check_signature were expecting a boolean.

Signed-off-by: Daniel Hiltgen <450e8eee12e8d348f09427c205cd53e1e4ff975a@docker.com>

pombredanne/docker-registry,depay/docker-registry,deis/docker-registry,whuwxl/docker-registry,wakermahmud/docker-registry,whuwxl/docker-registry,tangkun75/docker-registry,atyenoria/docker-registry,docker/docker-registry,dalvikchen/docker-registry,OnePaaS/docker-registry,ken-saka/docker-registry,docker/docker-registry,kireal/docker-registry,ken-saka/docker-registry,dalvikchen/docker-registry,kireal/docker-registry,atyenoria/docker-registry,depay/docker-registry,yuriyf/docker-registry,viljaste/docker-registry-1,stormltf/docker-registry,viljaste/docker-registry-1,wakermahmud/docker-registry,mboersma/docker-registry,atyenoria/docker-registry,pombredanne/docker-registry,mboersma/docker-registry,OnePaaS/docker-registry,pombredanne/docker-registry,OnePaaS/docker-registry,ptisserand/docker-registry,viljaste/docker-registry-1,stormltf/docker-registry,dalvikchen/docker-registry,deis/docker-registry,yuriyf/docker-registry,docker/docker-registry,ptisserand/docker-registry,kireal/docker-registry,tangkun75/docker-registry,stormltf/docker-registry,tangkun75/docker-registry,mboersma/docker-registry,whuwxl/docker-registry,depay/docker-registry,ken-saka/docker-registry,deis/docker-registry,wakermahmud/docker-registry,yuriyf/docker-registry,ptisserand/docker-registry