BUG#22310 dead/deceptive code in FileLogHandler::writeFooter() and File_class::flush

make the File_class::flush() method actually flush the stdio buffers.

ndb/src/common/logger/FileLogHandler.cpp

@@ -125,8 +125,6 @@ FileLogHandler::writeFooter()
   }
   callCount++;
 
-  // Needed on Cello since writes to the flash disk does not happen until 
-  // we flush and fsync.
   m_pLogFile->flush();
 }
 

ndb/src/common/util/File.cpp

@@ -188,10 +188,6 @@ File_class::flush() const
   ::fflush(m_file);
   return ::fsync(::fileno(m_file));
 #else
-  return 0;
+  return ::fflush(m_file);;
 #endif
 }
-
-//
-// PRIVATE
-//