Core/Log: Fix crash due to uninitialized variable

src/server/shared/Logging/AppenderFile.cpp

@@ -24,7 +24,8 @@ AppenderFile::AppenderFile(uint8 id, std::string const& name, LogLevel level, co
     logDir(_logDir),
     mode(_mode),
     maxFileSize(fileSize),
-    fileSize(0)
+    fileSize(0),
+    logfile(NULL)
 {
     dynamicName = std::string::npos != filename.find("%s");
     backup = _flags & APPENDER_FLAGS_MAKE_FILE_BACKUP;