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a4584410fc
The code computing the mask of pending signals used the per-queued
signal TLS pointer without checking it for NULL. Fix this by using
the process-wide signal mask in that case.
Fixes: 195169186bfd5 ("Cygwin: wait_sig: allow to compute process-wide mask of pending signals")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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