Fix leak in FAST OTP client processing

In set_pa_data(), after encoding the OTP request and stealing the
pointer from the resulting krb5_data object, free the krb5_data
container.

(cherry picked from commit 7029efc11525299b87b9024280ef1d9f82059ec5)

https://github.com/krb5/krb5/commit/0ff6cf86d047aeb246ac183c5b5d56ff1de8223b
Author: Greg Hudson <ghudson@mit.edu>
Committer: Tom Yu <tlyu@mit.edu>
Commit: 0ff6cf86d047aeb246ac183c5b5d56ff1de8223b
Branch: krb5-1.14
 src/lib/krb5/krb/preauth_otp.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)