Log Message:
-----------
Need to use the start pointer of a block we read from WAL segment in
the calculation, not the end pointer, as pointed out by Fujii Masao.
Modified Files:
--------------
pgsql/src/backend/replication:
walsender.c (r1.15 -> r1.16)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/replication/walsender.c?r1=1.15&r2=1.16)