unicode-encoding: Fix leaks in test

https://bugzilla.gnome.org/show_bug.cgi?id=711751

tests/unicode-encoding.c

@@ -416,5 +416,8 @@ main (int argc, char **argv)
       line++;
     }
 
+  g_free (testfile);
+  g_array_free (ucs4, TRUE);
+  g_free (contents);
   return exit_status;
 }