ue,worker_pool: fix logging of Msg3 UL grant

srsue/src/phy/nr/worker_pool.cc

@@ -115,14 +115,16 @@ int worker_pool::set_ul_grant(std::array<uint8_t, SRSRAN_RAR_UL_GRANT_NBITS> pac
   srsran_dci_ul_nr_t dci_ul = {};
 
   if (srsran_dci_nr_ul_unpack(NULL, &dci_msg, &dci_ul) < SRSRAN_SUCCESS) {
+    logger.error("Couldn't unpack UL grant");
     return SRSRAN_ERROR;
   }
 
   if (logger.info.enabled()) {
     std::array<char, 512> str;
-    srsran_dci_ul_nr_to_str(NULL, &dci_ul, str.data(), str.size());
+    srsran_dci_nr_t       dci = {};
+    srsran_dci_ul_nr_to_str(&dci, &dci_ul, str.data(), str.size());
     logger.set_context(phy_state.rar_grant_slot.idx);
-    logger.info("Setting RAR Grant %s", str.data());
+    logger.info("Setting RAR Grant: %s", str.data());
   }
 
   phy_state.set_ul_pending_grant(phy_state.rar_grant_slot, dci_ul);