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The chacha_use_simd static branch is required for x86 machines that
lack SSSE3 support. Restore it and the generic fallback code.
Reported-by: Eric Biggers <ebiggers@kernel.org>
Fixes: 9b4400215e ("crypto: x86/chacha - Remove SIMD fallback path")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>