Core/Misc: Fix issues reported by static analysis

Coverity defect IDs: 1316687, 1316688

src/common/Logging/AppenderFile.cpp

@@ -50,6 +50,8 @@ AppenderFile::AppenderFile(uint8 id, std::string const& name, LogLevel level, Ap
 
     if (extraArgs.size() > 2)
         _maxFileSize = atoi(extraArgs[2]);
+    else
+        _maxFileSize = 0;
 
     _dynamicName = std::string::npos != _fileName.find("%s");
     _backup = (flags & APPENDER_FLAGS_MAKE_FILE_BACKUP) != 0;

src/common/Logging/Log.cpp

@@ -27,7 +27,7 @@
 #include <cstdio>
 #include <sstream>
 
-Log::Log() : _ioService(nullptr), _strand(nullptr)
+Log::Log() : AppenderId(0), lowestLogLevel(LOG_LEVEL_FATAL), _ioService(nullptr), _strand(nullptr)
 {
     m_logsTimestamp = "_" + GetTimestampStr();
     RegisterAppender<AppenderConsole>();