Per registry.doRequest, res and client might be nil in case of error
For example, dns resolution errors, /etc/docker/certs.d perms, failed
loading of x509 cert ...
This will make res.StatusCode and res.Body SEGFAULT.
Signed-off-by: Arthur Gautier <baloo@gandi.net>
Upstream-commit: 3e6c69e5a1dbb428c4a62656f96cfe77c19986f9
Component: engine