[t:3825] #3825 Do not count free() operations when passed a NULL.

git-svn-id: file:///svn/toku/tokudb@33950 c7de825b-a66e-492c-adef-691d508d4ae1

windows/memory.c

@@ -77,13 +77,15 @@ toku_strdup(const char *s) {
 
 void
 toku_free(void *p) {
-    size_t used = p ? malloc_usable_size(p) : 0;
+    if (p) {
+	size_t used = malloc_usable_size(p);
 	__sync_add_and_fetch(&status.free_count, 1L);
 	__sync_add_and_fetch(&status.freed, used);
 	if (t_free)
 	    t_free(p);
 	else
 	    os_free(p);
+    }
 }
 
 void