Remove extra from getJavaType.

Bug: 32559427
Test: hidl_test_java

Change-Id: I1a96630eed1b61ab4ff2959ced2e83f94e8fb36d
diff --git a/Method.cpp b/Method.cpp
index fabf801..e3db869 100644
--- a/Method.cpp
+++ b/Method.cpp
@@ -160,9 +160,7 @@
             out += ", ";
         }
 
-        std::string extra;
-        out += arg->type().getJavaType(&extra);
-        out += extra;
+        out += arg->type().getJavaType();
         out += " ";
         out += arg->name();