IB/rxe: make rxe_unregister_device void

Since the function rxe_unregister_device always returns 0, it is changed
to void.

Signed-off-by: Zhu Yanjun <yanjun.zhu@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -1287,11 +1287,9 @@ err1:
 	return err;
 }
 
-int rxe_unregister_device(struct rxe_dev *rxe)
+void rxe_unregister_device(struct rxe_dev *rxe)
 {
 	struct ib_device *dev = &rxe->ib_dev;
 
 	ib_unregister_device(dev);
-
-	return 0;
 }

drivers/infiniband/sw/rxe/rxe_verbs.h

@@ -467,7 +467,7 @@ static inline struct rxe_mem *to_rmw(struct ib_mw *mw)
 }
 
 int rxe_register_device(struct rxe_dev *rxe);
-int rxe_unregister_device(struct rxe_dev *rxe);
+void rxe_unregister_device(struct rxe_dev *rxe);
 
 void rxe_mc_cleanup(struct rxe_pool_entry *arg);