remove dead code and replace unmanaged asn1_xer_print global variable by the appropriate existing debug flag

openair2/X2AP/x2ap_eNB_decoder.c

@@ -156,7 +156,7 @@ int x2ap_eNB_decode_pdu(X2AP_X2AP_PDU_t *pdu, const uint8_t *const buffer, uint3
                         length,
                         0,
                         0);
-  if (asn1_xer_print) {
+  if (LOG_DEBUGFLAG(DEBUG_ASN1)) {
     xer_fprint(stdout, &asn_DEF_X2AP_X2AP_PDU, pdu);
   }