pgsql: Fix printf mask for SizeVfdCache Qingqing Zhou

Log Message:
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Fix printf mask for SizeVfdCache

Qingqing Zhou

Modified Files:
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pgsql/src/backend/storage/file:
fd.c (r1.127 -> r1.128)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/storage/file/fd.c.diff?r1=1.127&r2=1.128)