* always aligned to a 64 bit boundary.
*
* The size of the buffer is in bytes, but is it assumed that it is
- * always ok to to read a complete multiple of 64 bits at the end
+ * always ok to read a complete multiple of 64 bits at the end
* of the block in case the end is no aligned to a natural boundary.
*
* Return: the block number (bitmap buffer scope) that was found