Revert "Deallocate SCH pdu on demux instead of pdu_queue"

This reverts commit e9fcb10c9e.

lib/include/srslte/common/buffer_pool.h

@@ -93,10 +93,6 @@ public:
 #endif
   }
 
-  uint32_t nof_available_pdus() {
-    return available.size();
-  }
-
   bool is_almost_empty() {
     return available.size() < capacity/20;
   }

lib/src/common/pdu_queue.cc

@@ -96,6 +96,11 @@ bool pdu_queue::process_pdus()
     if (callback) {
       callback->process_pdu(pdu->ptr, pdu->len, pdu->channel, pdu->tstamp);
     }
+    if (pdu->channel == DCH) {
+      if (!pool.deallocate(pdu)) {
+        log_h->warning("Error deallocating from buffer pool in process_pdus(): buffer not created in this pool.\n");
+      }
+    }
     cnt++;
     have_data = true;
   }

srsue/src/mac/demux.cc

@@ -148,8 +148,6 @@ void demux::process_pdu(uint8_t *mac_pdu, uint32_t nof_bytes, srslte::pdu_queue:
 
       process_sch_pdu(&mac_msg);
       //srslte_vec_fprint_byte(stdout, mac_pdu, nof_bytes);
-
-      pdus.deallocate(mac_pdu);
       break;
     case srslte::pdu_queue::BCH:
       rlc->write_pdu_bcch_dlsch(mac_pdu, nof_bytes);