RDS: Workaround for in-use MRs on close causing crash

if a machine is shut down without closing sockets properly, and
freeing all MRs, then a BUG_ON will bring it down. This patch
changes these to WARN_ONs -- leaking MRs is not fatal (although
not ideal, and there is more work to do here for a proper fix.)
Signed-off-by: NAndy Grover <andy.grover@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/rds/ib_rdma.c

@@ -234,8 +234,8 @@ void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *pool)
 {
 	flush_workqueue(rds_wq);
 	rds_ib_flush_mr_pool(pool, 1);
-	BUG_ON(atomic_read(&pool->item_count));
-	BUG_ON(atomic_read(&pool->free_pinned));
+	WARN_ON(atomic_read(&pool->item_count));
+	WARN_ON(atomic_read(&pool->free_pinned));
 	kfree(pool);
 }