CVE-2025-39804 lib/crypto: arm64/poly1305: Fix register corruption in no-SIMD contexts

In the Linux kernel, the following vulnerability has been resolved: lib/crypto: arm64/poly1305: Fix register corruption in no-SIMD contexts Restore the SIMD usability check that was removed by commit a59e5468a921 "crypto: arm64/poly1305 - Add block-only interface". This safety check is cheap and ...