Extra check for usb mounting during backup

src/freedombone

@@ -1569,6 +1569,11 @@ function create_backup_script {
   echo "  mkdir $USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo -n '  mount $USB_DRIVE ' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "$USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '  if [ ! "$?" = "0" ]; then' >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo "    echo 'There was a problem mounting the USB drive to $USB_MOUNT'" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo "    rm -rf $USB_MOUNT" >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '    exit 6392' >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo '  fi' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo 'fi' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "if [ ! -d $USB_MOUNT/backup ]; then" >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo "  mkdir $USB_MOUNT/backup" >> /usr/bin/$BACKUP_SCRIPT_NAME