ossl: Don't encryt/decrypt too much data for chacha20.

ossl: Don't encryt/decrypt too much data for chacha20.

The loops for Chacha20 and Chacha20+Poly1305 which encrypted/decrypted
full blocks of data used the minimum of the input and output segment
lengths to determine the size of the next chunk ('todo') to pass to
Chacha20_ctr32().  However, the input and output segments could extend
past the end of the ciphertext region into the tag (e.g.  if a "plain"
single mbuf contained an entire TLS record).  If the length of the tag
plus the length of the last partial block together were at least as
large as a full Chacha20 block (64 bytes), then an extra block was
encrypted/decrypted overlapping with the tag.  Fix this by also
capping the amount of data to encrypt/decrypt by the amount of
remaining data in the ciphertext region ('resid').

Reported by:	gallatin
Reviewed by:	cem, gallatin, markj
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D29517