drbd: conn_send_state_req(): Return 0 upon success and an error code otherwise

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index aa42618..1cc8dd7 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1962,7 +1962,7 @@
 				      union drbd_state mask, union drbd_state val)
 {
 	enum drbd_packet cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ;
-	return !_conn_send_state_req(tconn, 0, cmd, mask, val);
+	return _conn_send_state_req(tconn, 0, cmd, mask, val);
 }
 
 static inline void drbd_thread_stop(struct drbd_thread *thi)