9589 ldterm_dosig() can send empty mblks downstream Reviewed by: Dominik Hassler <hadfl@omniosce.org>

Review Request #1101 — Created June 9, 2018 and submitted — Latest diff uploaded

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9589
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9589 ldterm_dosig() can send empty mblks downstream Reviewed by: Dominik Hassler <hadfl@omniosce.org>

Tested with tmux linked against xpg6-values.o
Used dtrace to monitor putnext() to check that the null blocks are no longer sent.

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