RTEMS | posix/lio_listio.c: Missing a release of a lock on a path. (#5127)

[Alessandro Nardin (@AlessandroNardin)]

Alessandro Nardin created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5127



## Summary

Coverity CID 1619145

Coverity notes that there are path in `lio_listio()` where the function return without freeing some memory.

```
** CID 1619145:    (LOCK)
/cpukit/posix/src/lio_listio.c: 175 in lio_listio()
/cpukit/posix/src/lio_listio.c: 206 in lio_listio()


________________________________________________________________________________________________________
*** CID 1619145:    (LOCK)
/cpukit/posix/src/lio_listio.c: 175 in lio_listio()
169         }
170       }
171       rtems_aio_completed_list_op( listcbp );
172     
173       if ( mode == LIO_NOWAIT ) {
174         if ( error == 1 ) {
>>>     CID 1619145:    (LOCK)
>>>     Returning without unlocking "listcbp->mutex".
175           rtems_set_errno_and_return_minus_one( EIO );
176         }
177       } else if ( mode == LIO_WAIT ) {
178         rtems_event_set event_out;
179         rtems_event_system_receive(
180           RTEMS_EVENT_SYSTEM_AIO_LIST,
/cpukit/posix/src/lio_listio.c: 206 in lio_listio()
200               }
201             }
202           }
203         }
204       }
205     
>>>     CID 1619145:    (LOCK)
>>>     Returning without unlocking "listcbp->mutex".
206       return 0;
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5127
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