Deallocate a session-duration function descriptor

The session-duration function descriptor has a PER_SESSION memory duration. The function descriptor remains active until either of the following events occurs:

The mi_routine_end() function explicitly releases the session-duration function descriptor.
To explicitly free a session-duration function descriptor, you must free both the function descriptor with mi_routine_end() and the associated PER_SESSION named memory with mi_named_free(), as the following code fragment shows:
```
/* Free resources for the session-duration function
 * descriptor 
 */
if ( mi_routine_end(sess_conn, *fdesc) != MI_OK )
   {
   /* Handle error */
   ...
   }
mi_named_free("funcptr_blk", PER_SESSION);
```
The client application ends the session.
The database server automatically frees memory for the session-duration function descriptor and its PER_SESSION named memory at the end of the session.