mwan3: move mwan3_init call in mwwan3track into main

Initialize TRACK_OUTPUT has been set after INTERFACE variable initialization.
Move definition into main fixes this issue.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/mwan3/files/usr/sbin/mwan3track

@@ -9,9 +9,6 @@ DEVICE=""
 
 IFDOWN_EVENT=0
 IFUP_EVENT=0
-TRACK_OUTPUT=$MWAN3TRACK_STATUS_DIR/$INTERFACE/TRACK_OUTPUT
-
-mwan3_init
 
 stop_subprocs() {
 	[ -n "$SLEEP_PID" ] && kill "$SLEEP_PID" && unset SLEEP_PID
@@ -169,6 +166,10 @@ main() {
 	INTERFACE=$1
 	STATUS=""
 	STARTED=0
+	TRACK_OUTPUT=$MWAN3TRACK_STATUS_DIR/$INTERFACE/TRACK_OUTPUT
+
+	mwan3_init
+
 	mkdir -p $MWAN3TRACK_STATUS_DIR/$INTERFACE
 
 	trap clean_up TERM