Wrong triggering of pdt_walk_o signal when req_trans_i is 0

[mhayat-10xe]

Below is the counter-example of a failed assertion, in the 14th cycle, when request_type_q is idle, leading to req_trans_i being 0, pdt_walk_o should be 0. However, pdt_walk_o is set to 1 in this case which is wrong.