pdf: add missing flush

Issue #342
1 job for master in 15 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed #34365
fedora:test

00:00:15

 
Name Stage Failure
failed
fedora:test Test There has been a runner system failure, please try again
Using Docker executor with image registry.gitlab.com/alatiera/librsvg-oci-images/amd64/fedora:latest ...
Pulling docker image registry.gitlab.com/alatiera/librsvg-oci-images/amd64/fedora:latest ...
ERROR: Preparation failed: Error response from daemon: Get https://registry.gitlab.com/v2/alatiera/librsvg-oci-images/amd64/fedora/manifests/latest: denied: access forbidden (executor_docker.go:168:0s)
Will be retried in 3s ...
Using Docker executor with image registry.gitlab.com/alatiera/librsvg-oci-images/amd64/fedora:latest ...
Pulling docker image registry.gitlab.com/alatiera/librsvg-oci-images/amd64/fedora:latest ...
ERROR: Preparation failed: Error response from daemon: Get https://registry.gitlab.com/v2/alatiera/librsvg-oci-images/amd64/fedora/manifests/latest: denied: access forbidden (executor_docker.go:168:0s)
Will be retried in 3s ...
ERROR: Job failed (system failure): Error response from daemon: Get https://registry.gitlab.com/v2/alatiera/librsvg-oci-images/amd64/fedora/manifests/latest: denied: access forbidden (executor_docker.go:168:0s)