Decrement the timeout being passed to poll() if poll was interrupted for some reason.  This will prevent an infinite loop if (say) a sigalarm is being scheduled at a more frequent interval than the poll timeout.
Decrement the timeout being passed to poll() if poll was interrupted for
some reason.  This will prevent an infinite loop if (say) a sigalarm is
being scheduled at a more frequent interval than the poll timeout.

PR:	2191, 8847, 10553

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase