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Depending on the configuration of the host and VM, a passthrough device may generate recurring DMA mapping errors at runtime. In such cases, reporting the issue once is sufficient. We have already the warn/error_report_once() routines taking a format and arguments. Using the same design pattern, add a new warning variant taking an 'Error *' parameter. Cc: Markus Armbruster <armbru@redhat.com> Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250206131438.1505542-2-clg@redhat.com Signed-off-by: Cédric Le Goater <clg@redhat.com>