Fix segfault of "pan" on signal action. pan segfaults when receiving various signal registered by sigaction. Valgrind reports various uninitalied bytes of the sigaction struct: Initializing the sigaction struct as empty avoids a segfault of "pan". Signed-off-by: Daniel Gollub <dgollub@suse.de>. Acked-by: Nate Straz <nstraz@redhat.com>.
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