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qemu-img: Suppress unhelpful extra errors in convert, resize
add_old_style_options() for img_convert() and img_resize() use qemu_opt_set(), which reports errors with qerror_report_err(). Its error messages aren't helpful here, the caller reports one that actually makes sense. Reproducer: $ qemu-img convert -B raw in.img out.img qemu-img: Invalid parameter 'backing_file' qemu-img: Backing file not supported for file format 'raw' Switch to qemu_opt_set_err() to get rid of the unwanted messages. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
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