1. fix an old typo. A purgatory must be cleaned on every LF_PURGATORY_SIZE freeing,

   not every time.
2. Increase purgatory size.

include/lf.h:
  allocate larger purgatory
mysys/lf_alloc-pin.c:
  typo.

include/lf.h

@@ -95,7 +95,7 @@ nolock_wrap(lf_dynarray_iterate, int,
 */
 
 #define LF_PINBOX_PINS 4
-#define LF_PURGATORY_SIZE 10
+#define LF_PURGATORY_SIZE 100
 
 typedef void lf_pinbox_free_func(void *, void *, void*);
 

mysys/lf_alloc-pin.c

@@ -271,7 +271,7 @@ static int ptr_cmp(void **a, void **b)
 void _lf_pinbox_free(LF_PINS *pins, void *addr)
 {
   add_to_purgatory(pins, addr);
-  if (pins->purgatory_count % LF_PURGATORY_SIZE)
+  if (pins->purgatory_count % LF_PURGATORY_SIZE == 0)
     _lf_pinbox_real_free(pins);
 }