Fix some unbalanced sched_lock()/sched_unlock() pairs int the re-implemented VFS semaphore and message queue logic

fs/mqueue/mq_close.c

@@ -150,6 +150,7 @@ int mq_close(mqd_t mqdes)
        /* Decrement the reference count on the inode */
 
        mq_inode_release(inode);
+       sched_unlock();
      }
 
   return OK;

fs/mqueue/mq_open.c

@@ -235,9 +235,10 @@ mqd_t mq_open(const char *mq_name, int oflags, ...)
           inode->u.i_mqueue = msgq;
           msgq->inode       = inode;
         }
+
+      sched_unlock();
     }
 
-  sched_unlock();
   return mqdes;
 
 errout_with_msgq:

fs/mqueue/mq_unlink.c

@@ -160,6 +160,7 @@ int mq_unlink(FAR const char *mq_name)
 
   inode_semgive();
   mq_inode_release(inode);
+  sched_unlock();
   return OK;
 
 errout_with_semaphore:
@@ -168,5 +169,6 @@ errout_with_inode:
   inode_release(inode);
 errout:
   set_errno(errcode);
+  sched_unlock();
   return ERROR;
 }

fs/semaphore/sem_open.c

@@ -255,16 +255,17 @@ FAR sem_t *sem_open (FAR const char *name, int oflags, ...)
 
           sem = &nsem->ns_sem;
         }
+
+      sched_unlock();
     }
 
-  sched_unlock();
   return sem;
 
  errout_with_inode:
   inode_release(inode);
  errout_with_lock:
-  sched_unlock();
   set_errno(errcode);
+  sched_unlock();
   return (FAR sem_t *)ERROR;
 }
 

fs/semaphore/sem_unlink.c

@@ -162,7 +162,9 @@ int sem_unlink(FAR const char *name)
    */
 
   inode_semgive();
-  return sem_close((FAR sem_t *)inode->u.i_nsem);
+  ret = sem_close((FAR sem_t *)inode->u.i_nsem);
+  sched_unlock();
+  return ret;
 
 errout_with_semaphore:
   inode_semgive();
@@ -170,5 +172,6 @@ errout_with_inode:
   inode_release(inode);
 errout:
   set_errno(errcode);
+  sched_unlock();
   return ERROR;
 }