block/qapi: explicitly warn if !has_full_backing_filename
Disambiguate "Backing filename and full backing filename are equivalent" from "full backing filename could not be determined." Signed-off-by: NJohn Snow <jsnow@redhat.com> Message-id: 1450122916-4706-4-git-send-email-jsnow@redhat.com Reviewed-by: NMax Reitz <mreitz@redhat.com> Signed-off-by: NMax Reitz <mreitz@redhat.com>
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