chacha20-poly1305: fix wrong en/decryption on large input buffers
* cipher/chacha20.c (_gcry_chacha20_poly1305_encrypt) (_gcry_chacha20_poly1305_decrypt): Correctly use 'currlen' for chacha20 on the non-stitched code path.
This patch fixes bug which was introduced by commit:
"Add stitched ChaCha20-Poly1305 SSSE3 and AVX2 implementations" d6330dfb4b0e9fb3f8eef65ea13146060b804a97
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>