Drop extra blank lines from arraylist.h

arraylist.h

@@ -75,14 +75,12 @@ extern void *array_list_bsearch(const void **key, struct array_list *arr,
 
 extern int array_list_del_idx(struct array_list *arr, size_t idx, size_t count);
 
-
 /**
  * Shrink the array list to just enough to fit the number of elements in it,
  * plus empty_slots.
  */
 extern int array_list_shrink(struct array_list *arr, size_t empty_slots);
 
-
 #ifdef __cplusplus
 }
 #endif