RDMA/verbs: Simplify modify QP check

All callers to ib_modify_qp_is_ok() provides enum ib_qp_state
makes the checks of out-of-scope redundant. Let's remove them
together with updating function signature to return boolean result.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 7df3274..5eb10c24 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2480,9 +2480,9 @@ static inline bool ib_is_udata_cleared(struct ib_udata *udata,
  * transition from cur_state to next_state is allowed by the IB spec,
  * and that the attribute mask supplied is allowed for the transition.
  */
-int ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
-		       enum ib_qp_type type, enum ib_qp_attr_mask mask,
-		       enum rdma_link_layer ll);
+bool ib_modify_qp_is_ok(enum ib_qp_state cur_state, enum ib_qp_state next_state,
+			enum ib_qp_type type, enum ib_qp_attr_mask mask,
+			enum rdma_link_layer ll);
 
 void ib_register_event_handler(struct ib_event_handler *event_handler);
 void ib_unregister_event_handler(struct ib_event_handler *event_handler);