express: Delete the Eina_Tmpstr when we are finished with it

Signed-off-by: Chris Michael <cp.michael@samsung.com>

src/bin/gravatar.c

@@ -76,6 +76,8 @@ media_add(Evas_Object *obj, Gravatar *g)
           }
      }
 
+   eina_tmpstr_del(buff);
+
    return obj;
 }