validator: unbreak sysctl net.* validation
validator: unbreak sysctl net.* validation

When changing this validation, the code actually allowing the validation
to pass was removed. This meant that any net.* sysctl would always fail
to validate.

Fixes: bc84f83344fd ("fix docker/docker#27484")
Reported-by: Justin Cormack <af64ee19f04db9509cb02b0e470e11e5402ef9b3@docker.com>
Signed-off-by: Aleksa Sarai <a8eb12d32d6ec07cdf737175ec7d4a0f1b4e1ee7@suse.de>

cyphar/runc,kolyshkin/runc,justincormack/runc,stefanberger/runc,vbatts/runc,rhatdan/runc,crosbymichael/runc,xiaochenshen/runc,laijs/runc,estesp/runc,maxamillion/runc,hqhq/runc,opencontainers/runc,jhowardmsft/runc,avagin/runc,mheon/runc,coolljt0725/runc,xiaochenshen/runc,kolyshkin/runc,wking/runc,crosbymichael/runc,dqminh/runc,rhatdan/runc,xiaochenshen/runc,kolyshkin/runc,dqminh/runc,mheon/runc,cloudfoundry-incubator/runc,hqhq/runc,shishir-a412ed/runc,rajasec/runc,cloudfoundry-incubator/runc,mYmNeo/runc,sunyuan3/runc,shishir-a412ed/runc,cloudfoundry-incubator/runc,docker/runc,kolyshkin/runc,jhowardmsft/runc,wking/runc,jhowardmsft/runc,rhatdan/runc,WeiZhang555/runc,mikebrow/runc,rajasec/runc,shishir-a412ed/runc,sunyuan3/runc,hqhq/runc,cyphar/runc,estesp/runc,avagin/runc,rajasec/runc,docker/runc,justincormack/runc,dqminh/runc,mYmNeo/runc,docker/runc,adrianreber/runc,sunyuan3/runc,maxamillion/runc,WeiZhang555/runc,estesp/runc,mikebrow/runc,opencontainers/runc,crosbymichael/runc,laijs/runc,vbatts/runc,opencontainers/runc,justincormack/runc,opencontainers/runc,stefanberger/runc,avagin/runc,mYmNeo/runc,dqminh/runc,mheon/runc,mikebrow/runc,cyphar/runc,adrianreber/runc,rhatdan/runc,stefanberger/runc,coolljt0725/runc,vbatts/runc,WeiZhang555/runc,laijs/runc,maxamillion/runc,coolljt0725/runc,adrianreber/runc,wking/runc