ssh_client_fuzzer.cc: set blocking mode on (#553)
ssh_client_fuzzer.cc: set blocking mode on (#553)

file: ssh_client_fuzzer.cc

notes: the session needs blocking mode turned on to avoid EAGAIN being returned from libssh2_session_handshake()

credit:
Will Cosgrove, reviewed by Michael Buckley
libssh2/libssh2,libssh2/libssh2,libssh2/libssh2,libssh2/libssh2