block: Improve "Block node is read-only" message
This message does not make any sense when it appears as the response to making an R/W node read-only. We should detect that case and emit a different message, then. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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