IB/rdmavt: Trivial function comment corrected.

Corrected function name in comment from qib_ to rvt_.
Signed-off-by: NParav Pandit <pandit.parav@gmail.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rdmavt/qp.c

@@ -1016,7 +1016,7 @@ static void rvt_insert_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp)
 }
 
 /**
- * qib_modify_qp - modify the attributes of a queue pair
+ * rvt_modify_qp - modify the attributes of a queue pair
  * @ibqp: the queue pair who's attributes we're modifying
  * @attr: the new attributes
  * @attr_mask: the mask of attributes to modify