client.c:

client.c:
clientgen.c:
clientutil.c:
clitar.c: Changed usage of receive_smb to new function client_receive_smb
          except for one use of receive_smb in client.c. This is the
          receive_smb used to discard packets received whilst in a
          keyboard wait state.
util.c: Created new function client_receive_smb that ignores session
        keepalives just as the old receive_smb used to do. Created
        internal function read_smb_length_return_keepalive that is
        used internally by the changed receive_smb call.
        Changed read_smb_len to not use an internal buffer - it is
        never called with a null buffer so such code is redundant.
Jeremy.