ecmult_gen: Simplify code (no observable change)

src/ecmult_gen_impl.h

@@ -97,12 +97,11 @@ static void secp256k1_ecmult_gen_blind(secp256k1_ecmult_gen_context *ctx, const
         return;
     }
     /* The prior blinding value (if not reset) is chained forward by including it in the hash. */
-    secp256k1_scalar_get_b32(nonce32, &ctx->blind);
+    secp256k1_scalar_get_b32(keydata, &ctx->blind);
     /** Using a CSPRNG allows a failure free interface, avoids needing large amounts of random data,
      *   and guards against weak or adversarial seeds.  This is a simpler and safer interface than
      *   asking the caller for blinding values directly and expecting them to retry on failure.
      */
-    memcpy(keydata, nonce32, 32);
     VERIFY_CHECK(seed32 != NULL);
     memcpy(keydata + 32, seed32, 32);
     secp256k1_rfc6979_hmac_sha256_initialize(&rng, keydata, 64);