message: Fix VS2017 warning
diff: @@ -55,8 +55,6 @@ rdcstr Fmt(const char *format, ...)
  rdcstr Callstack::AddressDetails::formattedString(const char *commonPath)
  {
  - char fmt[512] = {0};
  -
  const char *f = filename.c_str();
  if(commonPath)
  