ENH : avoid warnings

Utilities/dxflib/dl_dxf.h

@@ -309,6 +309,7 @@ public:
         } else {
             return def;
         }
+      return def;
     }
     /**
      * Converts the given string into a string or returns the given 

Utilities/otbossimplugins/ossim/RadarSat/Leader/DataHistogramProcessedData.h

@@ -38,7 +38,7 @@ public:
   /**
    * @brief Destructor
    */
-  ~DataHistogramProcessedData();
+  virtual ~DataHistogramProcessedData();
 
   /**
    * @brief Copy constructor

Utilities/otbossimplugins/ossim/RadarSat/Leader/DataHistogramSignalData.h

@@ -35,7 +35,7 @@ public:
   /**
    * @brief Destructor
    */
-  ~DataHistogramSignalData();
+  virtual ~DataHistogramSignalData();
 
   /**
    * @brief Copy constructor

Utilities/otbossimplugins/ossim/RadarSat/Leader/DataQuality.h

@@ -37,7 +37,7 @@ public:
   /**
    * @brief Destructor
    */
-  ~DataQuality();
+  virtual ~DataQuality();
 
   /**
    * @brief Copy constructor

Utilities/otbossimplugins/ossim/RadarSat/Leader/DataSetSummary.h

@@ -33,7 +33,7 @@ public:
   /**
    * @brief Destructor
    */
-  ~DataSetSummary();
+  virtual ~DataSetSummary();
 
   /**
    * @brief This function write the DataSetSummary in a stream

Utilities/otbossimplugins/ossim/RadarSat/Leader/FileDescriptor.h

@@ -33,7 +33,7 @@ public:
   /**
    * @brief Destructor
    */
-  ~FileDescriptor();
+  virtual ~FileDescriptor();
 
   /**
    * @brief This function writes the FileDescriptor in a stream

Utilities/otbossimplugins/ossim/RadarSat/RadarSatRecord.h

@@ -34,7 +34,7 @@ public:
   /**
    * @brief Destructor
    */
-  ~RadarSatRecord();
+  virtual ~RadarSatRecord();
 
   /**
    * @brief Copy constructor