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

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;
 }