Log Message:
-----------
I can't see any good reason for DropRelFileNodeBuffers to be issuing
FATAL when it detects a nonzero reference count. Reduce to ERROR.
Modified Files:
--------------
pgsql-server/src/backend/storage/buffer:
bufmgr.c (r1.176 -> r1.177)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/storage/buffer/bufmgr.c.diff?r1=1.176&r2=1.177)