am 6a1b7a85: Return BUFFER_UNDERFLOW if no source bytes were consumed.
am 6a1b7a85: Return BUFFER_UNDERFLOW if no source bytes were consumed.

* commit '6a1b7a85dcdeb19305ad5153579bd11c1eb0bfad':
  Return BUFFER_UNDERFLOW if no source bytes were consumed.

google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt,google/conscrypt