covscan: free ucs2-encoded password copy when generating NTLM hash
On successful code path we leak internal copy of the ucs2-encoded
password.
Fixes: https://pagure.io/freeipa/issue/8131
Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>