unmount tmpfs if RAM too small to prevent corruption of logdir

log2ram

@@ -27,6 +27,8 @@ syncFromDisk () {
 
     if [ ! -z `du -sh -t $SIZE $HDD_LOG | cut -f1` ]; then
         echo "ERROR: RAM disk too small. Can't sync."
+        umount -l $RAM_LOG
+        umount -l $HDD_LOG
         exit 1
     fi