[CRYPTO] cast6: inline bloat--

Bloat-o-meter shows rather high readings for cast6...

crypto/cast6.c:
  cast6_setkey  | -1310
  cast6_encrypt | -4567
  cast6_decrypt | -4561
 3 functions changed, 10438 bytes removed, diff: -10438

crypto/cast6.c:
  W    | +659
  Q    | +308
  QBAR | +316
 3 functions changed, 1283 bytes added, diff: +1283

crypto/cast6.o:
 6 functions changed, 1283 bytes added, 10438 bytes removed, diff: -9155

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>