Log Message:
-----------
Disallow the cost balancing code from resulting in a zero cost limit, which
causes a division-by-zero error in the vacuum code.  This can happen when there
are more workers than cost limit units.

Per report from Galy Lee in
<[EMAIL PROTECTED]>.

Modified Files:
--------------
    pgsql/src/backend/postmaster:
        autovacuum.c (r1.48 -> r1.49)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/postmaster/autovacuum.c.diff?r1=1.48&r2=1.49)

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