Merge pull request #614 from LK4D4/fix_validate

Fix hack/validate.sh

Author: vmarmol

hack/validate.sh

@@ -4,6 +4,7 @@ set -e
 # This script runs all validations
 
 validate() {
+    export MAKEDIR=/go/src/github.com/docker/docker/hack/make
     sed -i 's!docker/docker!docker/libcontainer!' /go/src/github.com/docker/docker/hack/make/.validate
     bash /go/src/github.com/docker/docker/hack/make/validate-dco
     bash /go/src/github.com/docker/docker/hack/make/validate-gofmt