Hide warning of unused variable

From the comment above the line with the warning:
> This asn1cCalloc leaks memory but also masks a bug.
> If we delete this asn1cCalloc statement, eNB will crash in NSA mode.
> Please don't delete the following line unless the bug has been found

openair2/RRC/LTE/MESSAGES/asn1_msg.c

@@ -4297,6 +4297,7 @@ ssize_t do_nrMeasurementReport(uint8_t *buffer,
      If we delete this asn1cCalloc statement, eNB will crash in NSA mode.
      Please don't delete the following line unless the bug has been found. */
   asn1cCalloc(measresulteutra_list->cgi_Info, measresult_cgi2);
+  (void) measresult_cgi2;
   struct LTE_MeasResultEUTRA__measResult* measResult= &measresulteutra_list->measResult;
   asn1cCallocOne(measResult->rsrpResult, rsrp_tar);
   asn1cCallocOne(measResult->rsrqResult, rsrq_tar);