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Thanks to J. Commelin for the patch.

Furthermore we need to open the file for writing if we want to lock it for writing.

We need to know the document's 'scale' value earlier (before cairo
surfaces are created). Otherwise, cairo surfaces will be re-created and
wrong page will be rendered (since zoom doesn't preserve page number).
Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
Signed-off-by: Sebastian Ramacher <s.ramacher@gmx.at>

It never returns NULL. If this function fails, the application is
terminated.
Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>
Signed-off-by: Sebastian Ramacher <s.ramacher@gmx.at>