fixing NAS PCAP ctor

lib/src/common/nas_pcap.cc

@@ -30,15 +30,15 @@ void nas_pcap::enable()
 {
   enable_write = true;
 }
-void nas_pcap::open(const char* filename, uint32_t ue_id)
+void nas_pcap::open(const char* filename, uint32_t ue_id_)
 {
   pcap_file    = LTE_PCAP_Open(NAS_LTE_DLT, filename);
-  ue_id        = ue_id;
+  ue_id        = ue_id_;
   enable_write = true;
 }
 void nas_pcap::close()
 {
-  fprintf(stdout, "Saving NAS PCAP file\n");
+  fprintf(stdout, "Saving NAS PCAP file (DLT=%d)\n", NAS_LTE_DLT);
   LTE_PCAP_Close(pcap_file);
 }