[Secsss] Fix mismatched new/free in XrdSecsssID::~XrdSecsssID()

The defaultID is created with defaultID = new XrdSecsssEnt(...); so
it cannot be deallocated with free(defaultID). Since the destructor
is private, we cannot call delete defaultID either. We must call the
specific function for this, which is defaultID->Delete(), which in
turn will call delete instead of free to deallocate the memory.

src/XrdSecsss/XrdSecsssID.cc

@@ -132,7 +132,7 @@ XrdSecsssID::XrdSecsssID(authType aType, const XrdSecEntity *idP,
 /* Private:                   D e s t r u c t o r                             */
 /******************************************************************************/
 
-XrdSecsssID::~XrdSecsssID() {if (defaultID) free(defaultID);}
+XrdSecsssID::~XrdSecsssID() {if (defaultID) defaultID->Delete();}
 
 /******************************************************************************/
 /* Private:                         F i n d                                   */