mwan3: fix wait conditions in mwan3track

Will only run when no events are pending.

Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>
[ Update description and split into own commit ]
Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/mwan3/files/usr/sbin/mwan3track

@@ -346,7 +346,7 @@ main() {
 		get_uptime > $MWAN3TRACK_STATUS_DIR/$INTERFACE/TIME
 
 		host_up_count=0
-		if [ "${IFDOWN_EVENT}" -ne 0 ] && [ "${IFUP_EVENT}" -ne 0 ]; then
+		if [ "${IFDOWN_EVENT}" -eq 0 ] && [ "${IFUP_EVENT}" -eq 0 ]; then
 			sleep "${sleep_time}" &
 			SLEEP_PID=$!
 			wait