Update mouse_upper.c

drivers/input/mouse_upper.c

@@ -44,7 +44,7 @@ struct mouse_openpriv_s
   struct circbuf_s   circbuf; /* Store mouse point data in circle buffer */
   struct list_node   node;    /* Opened file buffer linked list node */
   FAR struct pollfd *fds;     /* Polling structure of waiting thread */
-  sem_t              waitsem; /* Used to wait for the availability of data  */
+  sem_t              waitsem; /* Used to wait for the availability of data */
   mutex_t            lock;    /* Manages exclusive access to this structure */
 };