pg_basebackup is not checking IDENTIFY_SYSTEM numbre of columns

Hi,

I just notice $SUBJECT and this could lead us to a segmentation fault
if by accident we point to a system with a different number of columns
in IDENTIFY_SYSTEM, at least i point pg_receivexlog from current head
to a 9.0 instalation and got that.

Any reason for not checking number of columns?

-- 
Jaime Casanova         www.2ndQuadrant.com
Professional PostgreSQL: Soporte 24x7 y capacitación