jni: Fix return argument of bt Resolve.

Change-Id: I01779c808dc59600017e3fd61ce1caae58737779
diff --git a/impl/google/rpc/protocols/bt/bt_android.go b/impl/google/rpc/protocols/bt/bt_android.go
index 275cc12..148a914 100644
--- a/impl/google/rpc/protocols/bt/bt_android.go
+++ b/impl/google/rpc/protocols/bt/bt_android.go
@@ -62,8 +62,8 @@
 	return newConnection(env, jStream), nil
 }
 
-func (btProtocol) Resolve(ctx *context.T, protocol, address string) (string, string, error) {
-	return protocol, address, nil
+func (btProtocol) Resolve(ctx *context.T, protocol, address string) (string, []string, error) {
+	return protocol, []string{address}, nil
 }
 
 func (btProtocol) Listen(ctx *context.T, protocol, address string) (flow.Listener, error) {