crypto: glue_helper - Delete some dead code

We checked (nbytes < bsize) inside the loops so it's not possible to hit
the "goto done;" here.  This code is cut and paste from other slightly
different loops where we don't have the check inside the loop.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>