tests: Remove duplicated mkdir for LOGDIR

LOGDIR directory is created automatically if LOGDIR variable was not
set. If the variable is set, that directory is expected to exist.

Signed-hostap: Jouni Malinen <j@w1.fi>

tests/hwsim/start.sh

@@ -62,7 +62,6 @@ if [ "$CONCURRENT" = "y" ]; then
     sudo iw wlan1 interface add sta1 type station
     sudo iw wlan2 interface add sta2 type station
 fi
-mkdir -p $LOGDIR
 sudo ifconfig hwsim0 up
 sudo $WLANTEST -i hwsim0 -n $LOGDIR/hwsim0.pcapng -c -d > $LOGDIR/hwsim0 &
 for i in 0 1 2; do