Retain TC bit if original message was already marked truncated #1171
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Retain TC bit if original message was already marked truncated.
Fixes coredns/coredns#4183
This could alternately be fixed in coredns/coredns, although I can't think how reverting the TC bit would be desirable in any scenario, hence suggesting the fix upstream here.
Signed-off-by: Chris O'Haver cohaver@infoblox.com