App: [skip ci] fix memory leaks:

Found two memory leaks in class Enumeration
* method tearDown() always ignored to free the memory of the first element
* assignment operator didn't call tearDown() when needed

src/App/Enumeration.cpp

@@ -84,8 +84,8 @@ void Enumeration::tearDown(void)
     char **plEnums = (char **)_EnumArray;
 
     // Delete C Strings first
-    while (*(plEnums++) != NULL) {
-        free(*plEnums);
+    while (*plEnums != NULL) {
+        free(*(plEnums++));
     }
 
     delete [] _EnumArray;
@@ -288,9 +288,16 @@ bool Enumeration::isValid(void) const
 
 Enumeration & Enumeration::operator=(const Enumeration &other)
 {
+    if (this == &other)
+        return *this;
+
     if (other._ownEnumArray) {
         setEnums(other.getEnumVector());
     } else {
+        if (isValid() && _ownEnumArray) {
+            tearDown();
+        }
+
         _EnumArray = other._EnumArray;
     }