epee: fix invalid memory write reading an array entry

Reported by Lilith Wyatt at Talos.

Since this is not needed in normal operation, I just let this
error out.

contrib/epee/include/storages/portable_storage_from_bin.h

@@ -59,6 +59,7 @@ namespace epee
       storage_entry load_storage_entry();
       void read(section& sec);
       void read(std::string& str);
+      void read(array_entry &ae);
     private:
       struct recursuion_limitation_guard
       {
@@ -114,6 +115,7 @@ namespace epee
     void throwable_buffer_reader::read(t_pod_type& pod_val)
     {
       RECURSION_LIMITATION();
+      static_assert(std::is_pod<t_pod_type>::value, "POD type expected");
       read(&pod_val, sizeof(pod_val));
     }
 
@@ -277,5 +279,11 @@ namespace epee
       m_ptr+=len;
       m_count -= len;
     }
+    inline
+    void throwable_buffer_reader::read(array_entry &ae)
+    {
+      RECURSION_LIMITATION();
+      CHECK_AND_ASSERT_THROW_MES(false, "Reading array entry is not supported");
+    }
   }
 }