baseboard/trogdor/postinstall: create rmtfs directory before using it

Author: Maccraft123

baseboard/trogdor/postinstall

@@ -6,6 +6,7 @@ if [ -z "$DESTDIR" ]; then
 	exit 1
 fi
 
+mkdir -p "$DESTDIR/var/lib/rmtfs"
 for name in fs1 fs2 fsg fsc; do
 	dd if=/dev/zero of="$DESTDIR/var/lib/rmtfs/modem_$name" bs=1M count=2
 done