Fix error refcounting.

src/core/ext/client_config/client_channel.c

@@ -571,8 +571,10 @@ static bool pick_subchannel(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
     }
     gpr_mu_unlock(&chand->mu);
     GPR_TIMER_END("pick_subchannel", 0);
+    GRPC_ERROR_UNREF(error);
     return true;
   }
+  GPR_ASSERT(error == GRPC_ERROR_NONE);
   if (chand->lb_policy != NULL) {
     grpc_lb_policy *lb_policy = chand->lb_policy;
     int r;

src/core/lib/channel/deadline_filter.c

@@ -63,6 +63,7 @@ gpr_log(GPR_INFO, "DEADLINE_EXCEEDED");
         GRPC_ERROR_CREATE("Deadline Exceeded"),
         GRPC_ERROR_INT_GRPC_STATUS, GRPC_STATUS_DEADLINE_EXCEEDED);
     elem->filter->start_transport_stream_op(exec_ctx, elem, &op);
+    GRPC_ERROR_UNREF(op.cancel_error);
   }
   GRPC_CALL_STACK_UNREF(exec_ctx, deadline_state->call_stack, "deadline_timer");
 }