/* Initializes 'b' as an empty ofpbuf that contains the 'allocated' bytes of
* memory starting at 'base'. 'base' should point to a buffer on the stack.
* (Nothing actually relies on 'base' being allocated on the stack. It could
- * be static or malloc()'d memory. But stack space is the most common usen
+ * be static or malloc()'d memory. But stack space is the most common use
* case.)
*
* 'base' should be appropriately aligned. Using an array of uint32_t or