freerdp: out-of-bounds read in ntlm_read_ntlm_v2_client_challenge function

In FreeRDP less than or equal to 2.0.0, there is an out-of-bound read in ntlmreadntlmv2clientchallenge that reads up to 28 bytes out-of-bound to an internal structure. This has been fixed in 2.1.0...