cppcheck: Quiet bad "sscanf format string wrong number of arguments" …

…warning in mheg.

The right number of arguments are present, they just aren't being
parsed by cppcheck because they use the SCNd64 macro to get the
correct per platform format argument.

mythtv/libs/libmythtv/mheg/netstream.cpp

@@ -329,6 +329,7 @@ static qlonglong inline ContentRange(const QNetworkReply *reply,
     // See RFC 2616 14.16: 'bytes begin-end/size'
     qulonglong len = 0;
     const char *fmt = " bytes %20" SCNd64 " - %20" SCNd64 " / %20" SCNd64;
+    // cppcheck-suppress wrongPrintfScanfArgNum
     if (3 != std::sscanf(range.constData(), fmt, &first, &last, &len))
     {
         LOG(VB_GENERAL, LOG_ERR, LOC + QString("Invalid Content-Range:'%1'")