csky: Fix a4/a5 restoration in syscall trace path

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CVE-2026-93167 · Microsoft / collected KEV context

cve-program · CVE-2026-93167

• https://git.kernel.org/stable/c/e9ae8e86eed68bea5d2670eadf61938a43bd2263
• https://git.kernel.org/stable/c/64e3ec7a71d3b715e2567f19f64207f04999bb0c
• https://git.kernel.org/stable/c/863fa63fd1491f201ac819f805a8db98d2a32c3d
• https://git.kernel.org/stable/c/e71a3dc5b8d2ea4d9cfbdb135d6b7777de84212e
• https://git.kernel.org/stable/c/31c81b376e5f058c7f2c94f69719cf7caec2fc3f
• https://git.kernel.org/stable/c/a776afa89424570bfa637ebf812ca281a5732904
• https://git.kernel.org/stable/c/343aa5275484d627c921a42e8e115cae366be5de
• https://git.kernel.org/stable/c/abb81e5ce7d995baa41556b8125fa59e28ba3be8

No related operational record is retained in the current change model.