Log Message:
-----------
Fix off-by-one error in autovacuum shmem struct sizing. This could lead to
autovacuum worker sending SIGUSR1 signal to wrong process, per Zou Yong's
report.
Backpatch to 8.3.
Modified Files:
--------------
pgsql/src/backend/postmaster:
autovacuum.c (r1.86 -> r1.87)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/autovacuum.c?r1=1.86&r2=1.87)