Fix a typo detected in the chunk.h header file's code comments.
/* Adds a trailing zero to the current chunk and returns the pointer to the
* following part. The purpose is to be able to use a chunk as a series of
- * short independant strings with chunk_* functions, which do not need to be
+ * short independent strings with chunk_* functions, which do not need to be
* released. Returns NULL if no space is available to ensure that the new
* string will have its own trailing zero. For example :
* chunk_init(&trash);