UASMessageHandler: Add missing const in member functions

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/uas/UASMessageHandler.cc

@@ -26,7 +26,7 @@ UASMessage::UASMessage(int componentid, int severity, QString text)
     _text     = text;
 }
 
-bool UASMessage::severityIsError()
+bool UASMessage::severityIsError() const
 {
     switch (_severity) {
         case MAV_SEVERITY_EMERGENCY:

src/uas/UASMessageHandler.h

@@ -31,11 +31,11 @@ public:
     /**
      * @brief Get message source component ID
      */
-    int getComponentID()        { return _compId; }
+    int getComponentID() const       { return _compId; }
     /**
      * @brief Get message severity (from MAV_SEVERITY_XXX enum)
      */
-    int getSeverity()           { return _severity; }
+    int getSeverity() const          { return _severity; }
     /**
      * @brief Get message text (e.g. "[pm] sending list")
      */
@@ -47,7 +47,7 @@ public:
     /**
      * @return true: This message is a of a severity which is considered an error
      */
-    bool severityIsError();
+    bool severityIsError() const;
 
 private:
     UASMessage(int componentid, int severity, QString text);