patch for buffer overrun with sequences

Hi,

The buffer overrun while creating sequences turns out to be
a read access overrun. For the sake of doing things properly
here is a patch which fixes it.

This patch is for the file backend/commands/sequence.c.

87a88
> NameData name;
113c114,115
< value[i - 1] = PointerGetDatum(seq->seqname);
---
> namestrcpy(&name, seq->seqname);
> value[i - 1] = NameGetDatum(&name);

With regards from Maurice.