f2fs: do not count ENOENT for error case

Otherwise, we can get a wrong cp_error mark.

Cc: <stable@vger.kernel.org>
Fixes: a7b8618aa2 ("f2fs: avoid infinite loop to flush node pages")
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/node.c

@@ -1450,7 +1450,9 @@ page_hit:
 out_err:
 	ClearPageUptodate(page);
 out_put_err:
-	f2fs_handle_page_eio(sbi, page->index, NODE);
+	/* ENOENT comes from read_node_page which is not an error. */
+	if (err != -ENOENT)
+		f2fs_handle_page_eio(sbi, page->index, NODE);
 	f2fs_put_page(page, 1);
 	return ERR_PTR(err);
 }