net/mwan3: fix mwan3track kill execution

If two interface have the same prefix "wan" for example "wan" and "wan1"
pgrep returns the PID for wan1 also "pgrep -f mwan3track wan".

Before this fix "wan1" was also killed! This is not what we want.

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

net/mwan3/files/usr/sbin/mwan3

@@ -36,7 +36,7 @@ ifdown()
 
 	ACTION=ifdown INTERFACE=$1 /sbin/hotplug-call iface
 
-	kill $(pgrep -f "mwan3track $1") &> /dev/null
+	kill $(pgrep -f "mwan3track $1 $2") &> /dev/null
 }
 
 ifup()

net/mwan3/files/usr/sbin/mwan3track

@@ -10,7 +10,7 @@ IFDOWN_EVENT=0
 
 clean_up() {
 	$LOG notice "Stopping mwan3track for interface \"${INTERFACE}\""
-	if [ "$(pgrep -f "mwan3track ${INTERFACE}")" = "" ]; then
+	if [ "$(pgrep -f "mwan3track ${INTERFACE} ${DEVICE}")" = "" ]; then
 		rm -rf "/var/run/mwan3track/${INTERFACE}" &> /dev/null
 	fi
 	if [ -z "$(ls -A "/var/run/mwan3track")" ]; then