Fix a leak in Dalvik_dalvik_system_DexFile_openDexFile

(cherry-pick of 7bf47d1d0d95c3ea9dfa7472e473edc820f21009.)

Change-Id: I0d4b96125e185b37767873e6fd88a59b63b6f7bd
diff --git a/vm/native/dalvik_system_DexFile.cpp b/vm/native/dalvik_system_DexFile.cpp
index f328a19..69cb71d 100644
--- a/vm/native/dalvik_system_DexFile.cpp
+++ b/vm/native/dalvik_system_DexFile.cpp
@@ -232,6 +232,7 @@
         free(sourceName);
     }
 
+    free(outputName);
     RETURN_PTR(pDexOrJar);
 }