Remove printf of {{{set callback}}}. Fixes #1755.

git-svn-id: file:///svn/toku/tokudb@11913 c7de825b-a66e-492c-adef-691d508d4ae1

src/ydb.c

@@ -3822,5 +3822,5 @@ void db_env_set_checkpoint_callback (void (*callback_f)(void*), void* extra) {
     checkpoint_callback_f = callback_f;
     checkpoint_callback_extra = extra;
     toku_checkpoint_safe_client_unlock();
-    printf("set callback = %p, extra = %p\n", callback_f, extra);
+    //printf("set callback = %p, extra = %p\n", callback_f, extra);
 }