Compiler warning about overflow in xlog.c

Hi,

my compiler complains about overflow in xlog.c.

There is variable defined as char partialfname[MAXFNAMELEN]; but is used
as snprintf(partialfname, MAXPGPATH, "%s.partial", origfname);

There is no practical issue as the actual filename length is never over
MAXFNAMELEN even with the .partial suffix but the code should still be
fixed which is what attached one-line patch does.

--
  Petr Jelinek                  http://www.2ndQuadrant.com/
  PostgreSQL Development, 24x7 Support, Training & Services