MDEV-23456: After-merge fix

In merge commit 34212233
buf_page_create() passed the wrong parameter to
one of the buf_LRU_block_free_non_file_page() calls.

storage/innobase/buf/buf0buf.cc

@@ -3860,7 +3860,7 @@ buf_page_create(fil_space_t *space, uint32_t offset,
       if (block->page.io_fix() != BUF_IO_NONE)
       {
         hash_lock->write_unlock();
-        buf_LRU_block_free_non_file_page(block);
+        buf_LRU_block_free_non_file_page(free_block);
         mutex_exit(&buf_pool.mutex);
         goto loop;
       }