pthreads: Re-order some operations so that mutexes are placed in the inconsistent state BEFORE the clean-up callbacks are called.

sched/pthread/pthread_mutexconsistent.c

@@ -119,7 +119,6 @@ int pthread_mutex_consistent(FAR pthread_mutex_t *mutex)
               /* The thread associated with the PID no longer exists */
 
               mutex->pid    = -1;
-              mutex->flags &= _PTHREAD_MFLAGS_ROBUST;
 #ifdef CONFIG_PTHREAD_MUTEX_TYPES
               mutex->nlocks = 0;
 #endif
@@ -132,6 +131,9 @@ int pthread_mutex_consistent(FAR pthread_mutex_t *mutex)
             }
         }
 
+      /* Clear the inconsistent flag in any case */
+
+      mutex->flags &= _PTHREAD_MFLAGS_ROBUST;
       sched_unlock();
       ret = OK;
     }