[Java hidl-gen] Fix multi-dimensional arrays (used within structures, not

as method arguments).

Bug: 31438033
Change-Id: I8e29ae8eca2a9ef8a320e37ca0bb79dcfa8a9b9a
diff --git a/Interface.cpp b/Interface.cpp
index 66abf8b..10f6505 100644
--- a/Interface.cpp
+++ b/Interface.cpp
@@ -82,7 +82,9 @@
     }
 }
 
-std::string Interface::getJavaType() const {
+std::string Interface::getJavaType(
+        std::string *extra, bool /* forInitializer */) const {
+    extra->clear();
     return fullJavaName();
 }