fix: ref check to avoid loop

[zombieJ]

resolve ant-design/ant-design#41261

ref 调用 setState 会触发 rerender，在快速切换时 React 18 会将 batch 合并，这使得 setState 的 prev 一直是 null 会让 React 认为是 null -> node 状态导致死循环。测试环境模拟不出来这种情况。比较蛋疼。

[codecov]

Codecov Report

Merging #342 (62cc04c) into master (dac7918) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 62cc04c differs from pull request most recent head 5b4a5b7. Consider uploading reports for the commit 5b4a5b7 to get more accurate results

@@           Coverage Diff           @@
##           master     #342   +/-   ##
=======================================
  Coverage   90.51%   90.51%           
=======================================
  Files          11       11           
  Lines         548      548           
  Branches      167      161    -6     
=======================================
  Hits          496      496           
  Misses         52       52           

Impacted Files	Coverage Δ
src/index.tsx	94.35% <100.00%> (ø)

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