core: use `O_RDONLY` instead of ambiguous `0` flag
Signed-off-by: Eric Engestrom <eric@engestrom.ch> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
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Signed-off-by: Eric Engestrom <eric@engestrom.ch> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>