scoreboard: fix memory instructions accounting in the writeback

Signed-off-by: Alban Gruin <alban.gruin@irit.fr>

src/scoreboard.sv

@@ -182,7 +182,7 @@ module scoreboard #(
         else if (mem_q[trans_id_i[i]].sbe.fu inside {ariane_pkg::FPU, ariane_pkg::FPU_VEC})
           mem_n[trans_id_i[i]].sbe.ex.cause = ex_i[i].cause;
 
-        if (mem_n[trans_id_i[i]].sbe.fu != ariane_pkg::STORE)
+        if (mem_q[trans_id_i[i]].sbe.fu != ariane_pkg::STORE)
           has_mem_access_n[trans_id_i[i]] = 1'b0;
 
         is_cf_n[trans_id_i[i]] = 1'b0;