Update power.inc.sh

inc/power.inc.sh

@@ -1447,9 +1447,8 @@ POWERLOGGER_SERVICE(){
 		else
 			runEvery=${PW_MYSQL_LOG_INTERVAL_NORMAL}
 		fi
-		runEvery=$((runEvery + 0))
 		echo "HERE1: ${runEvery}"
-		runEvery=$(expr ${runEvery} * 60)
+		runEvery=$((${runEvery}*60))
 		echo "HERE1: ${runEvery}"
 		end=`date +%s`; runtime=$((end-start))
 		echo -e "script runtime: ${runtime}s"; echo "Sleeping for $(expr ${runEvery} - ${runtime})s"