core: add @nullable annotation
Subchannel can be nullable, add annotation for consitency
diff --git a/core/src/main/java/io/grpc/LoadBalancer.java b/core/src/main/java/io/grpc/LoadBalancer.java
index 1db9d36..d46d50a 100644
--- a/core/src/main/java/io/grpc/LoadBalancer.java
+++ b/core/src/main/java/io/grpc/LoadBalancer.java
@@ -199,7 +199,7 @@
// subchannel being null and error being OK means RPC needs to wait
private final Status status;
- private PickResult(Subchannel subchannel, Status status) {
+ private PickResult(@Nullable Subchannel subchannel, Status status) {
this.subchannel = subchannel;
this.status = Preconditions.checkNotNull(status, "status");
}